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Home My WebLink About740333.tiff RESOLUTION WHEREAS, it has come to the attention of the Board of County Commissioners, Weld County, Colorado, that there is a need for a further study of the coal creek flood plain as it affects the Town of Erie, the Erie Comprehensive Plan and the County and Regional Com- prehensive Plans in general, and WHEREAS, the Weld County Planning Commission by Resolution has recommended to the Board that such a study be made and has further recommended that a contribution of Seven Hundred Seventy-Five Dollars ($775. 00) be made by the County for such purpose, and WHEREAS, the Board has determined that it would be in the best interest of the County to make available Seven Hundred Seventy Five Dollars ($775. 00) for further study of the coal creek flood plain area in the vicinity of Erie in Weld County, Colorado. NOW, THEREFORE, BE IT RESOLVED, by the Board of County Commissioners, Weld County, Colorado, and it hereby authorizes and orders the payment of Seven Hundred Seventy-Five Dollars ($775. 00) as the County's share for a flood plain study of the coal creek area in the vicinity of Erie in Weld County, Colorado. The above and foregoing Resolution was, on motion duly made and seconded, adopted by the following vote on the 1st day of May, A. D. , 1974. BOARD OF COUNTY COMMISSIONERS WELD COUNTY, COLORADO /41 EitL.( \ I ( ( 2 jefiL A-A:4c ova,' ATTEST: Weld County Clerk and Recorder and Clerk to the Board By ^c ' Deputy County Clerk APPROVED AS TO FORM: County Attorney Ink 1, 740333 BEFORE THE WELD COUNTY PLANNING COMMISSION RESOLUTION OF RECOMMENDATION TO THE BOARD OF COUNTY COMMISSIONERS. Moved by John Weigand that the following resolution be intro- duced for passage by the Weld County Planning Commission : Be it therefore Resolved by the Weld County Planning Commission xtix c xbir hafika wimcp ximec m oily m5c rbu lm aroimah m rk Wa mclnyc W a mmicrocinamecrxsnx to recommend to the Board of County Commissioners approval and funding of the Coal Creek Flood Plain Study for the following reasons : It would aid Erie in carrying out their comprehensive plan and provide a legal basis for both Weld County and Erie to accurately zone the flood plain . This was in compliance with the County and Regional Comprehensive Plan in that this area is shown as a flood plain , but is not accurately described . xTroc rben xmecaroorrtumoi a crh xfravrocm»ctm'$n x im mbvrrec rrBcnc r mxfn xCuncurrx# x xCutmrcirec rxemcsc irrI m' xtrb< i xfrocfibc Mdm xmecarlscamc$nx Motion seconded by Glenn Anderson Vote : For Passage Abstain Against John Watson Glenn Anderson John Weigand Bill Elliott Dean Severin The Chairman declared the motion passed and ordered that a certified copy of this Resolution be forwarded with the file of this case to the Board of County Commissioners for further proceedings . CERTIFICATION OF COPY I , Linda Jose , Recording Secretary of the Weld County Planning Commission , do hereby certify that the above and foregoing Resolution is a true copy of the Resolution of the Planning Commission of Weld County , Colorado , dopted on April 16 , 1974 and re- corded in Book No . 4 of the proceedings of the said Planning Commission . Dated the 17th day of April 19 74 cLkaA__ S cretary WELD COUNTY COLORADO For Action To Burman Lorenson Date April 18 , 19744-1 For Info To Your Action Or Reply Is Required LSubject: On Or Before SUBJECT : Erie Comprehensive Plan - Coal Creek Flood Plain Study This memo is in response to your request to review the proposed Coal Creek Flood Plain Study and its affect on the Erie Compre- hensive Plan . Flood plains were delineated in the Erie Comprehensive Plan . ( see attached ) The work was done by a hydrologist employed by Phil Ray and Associates . He used existing 10 foot contour in- tervals . One of the major objectives of the Plan is to prevent develop- ment in the flood plain and maintain the area as open space . A flood plain study of Coal Creek by the Soil Conservation Service and the Colorado Water Conservation Board would serve two purposes to fulfill the objectives of the Erie Comprehensive Plan . These are : 1 ) It will provide the most accurate data available to clearly define the flood plain ; 2 ) It will provide a legal basis for local govern- ment (town and county ) to zone the flood plain to prevent urban encroachment and maintain it as an open area . Therefore , it appears as though a flood plain study as the type proposed would help implement the policies of the Erie Compre- hensive plan . 44e.?--)7_-1 ) Allen Jost Planner AJ/lJ COAL riee6,e /E2 e'/, f L.4,<' o5-'niz#,- ,2374 _.-. sce Borxc�cr WFco .._ .____--__ ____ ._�.__--_.___-- --------_ACS_-_._..- �e�pY.�i_____Cawtxs� 13x;77 :__ o7____Ci r*r_ f f f lr..1 T-vo/_ES 7m.e? , — i -f t 74' QT7,/c,e_A`_e .eyoCES ii- az_._/_4__ �mtrsk0,0varr1 - ¢Z.?+ , 0j • g,2.5":e4ter,v eA actc)-___47 . ., - ____ ...... _______________L724YE4 400 -- — _ ` 51/C vrela-_v_rro.vs -- 325Z) &5720 / ______725-___.- ---_..:_.7_-O 7:42-45 24 70/) 2s� l Z¢7≤ 77 ___.._ -4- _f N 4ars1Q_=SE rki t_CE . :iENJA.%U.N F. STA2LETON •4.; FELL(L. SPARKS ankirweni Den"-' "' +. Director FRaDERLC<V. [:ROEGRR � m_ • LARE.�1 D. MORRILL Vi -tiair , Durango Deputy Director U. G. BERTHELSON - r Rio Bianco Z. CL9RR CE E. BURR . --- %iN.M,l tai TAILtiCY C. CORN:LiIS i?doper JOHN U. VANOERHOOF . Governor LEE E FORD 11''G`ro" DEPARTMENT OF NATURAL RESOURCES m:GH E. P C.eREL Rocky'"° COLORADO WATER CONSERVATION BOARD HERBERT N. VANDEMOER s"-i"g 102 COLUMBINE BUILDING 1845 SHERMAN STREET RiCHA.RD S G7iL.LIAMS Telephone Grand junction DENVER, COLORADO 80203 303-892-3441 April 5 , 1974 _Lr. L. Scott Tucker Executive Director • .. Urban Drainage and Flood Control District , 181 East 56th Avenue Denver, Colorado 80216 Dear Scott: I am forwarding the revised plan of study -for the Flood Hazard Analyses on Coal Creek and Rock Creek. The revision includes suggestions from our meeting of March 13, 1974. Wayne indicated that paragraph 5 on page 4 will be - amended to provide one set of film positives at a scale of 1" -= 200 ' . With the aforementioned amendment, we find the plan of study satisfactory for signature. 1t is our hope that the plan of study can be signed without another meeting. I will be contacting your office by phone on April 10, 1974, to receive your comments and to plan the next step. It will be good to get the study under way as soon' as possible, since the photography should be taken before the trees and brush foliate. /l'. r',----Y:•.,-:-j-',--, r� ',� Very truly yours,15'.: ,�/ �:�� ICJ 1f `I]J' ..� y t IDONALD E- BRESSLER DEB:tam srv. ��f47 ,;�,J Chief, Flood Control -and cc: Mr. rp Barstdw Conservation Section _Ir. Burfair- r-enson wtenclosures ,•::%;',19I Merit- 7-C. 4--,9-14 /2'3 Rock,Coal Cre1C Esima1esDon -: BOULDER — Funding for flood plain informotion studies l for Rock-Creek and Cool Creek ' from Boulder County op- f porently will be less than anticipated, Boulder County's three commissioners were told here Thursday. 4 Funding needed. From the county for the-project, which is. 'to be completed by July, l975,{ will-be about$2,275 instead.of $3,000 as was • budgeted earlier, according to Rich Kerbel of the Boulder County Engineering Department: i Kerbel explained that other funding for the 'estim4 red- 537,000 project;will be ob-. rained from the Soil ton servation Board($2400), he j' Colorado Water Conservation f Board (S6,50O).. the Urban I' Drainage and Flood 'Control°:l District ($3.250), Weld County ($775) and the tool Creek Water _Users-. Association (approximately-5200): Kerbel added that'funding from Weldtountyand the Coal Creek .organization had not been confirmed yet but that both-had indicated favorable • response. The studies ore to be.similar to the St. Vrain'Creek Flood Control survey, which is to (come before the county. _ommissioners for-final ap- \Loval here in June. . c FLOOD HAZARD ANALYSES Coal Creek and Rock Creek Boulder and Weld Counties Colorado PLAN OF STUDY • Prepared by the COLORADO WATER CONSERVATION BOARD BOULDER COUNTY WELD COUNTY URBAN DRAINAGE AND FLOOD CONTROL DISTRICT SOIL CONSERVATION_SERVICE, USDA April 1974 { INTRODUCTION This flood hazard analyses plan of study for Coal Creek and Rock Creek was jointly prepared by the Colorado Water Conservation _Board, the County Commissioners of Boulder County and Weld County, the Urban Drainage and Flood Control District, and the Soil Conservation Service. The purpose of the Plan of Study is to describe the objective of the study, the intended uses of the data and _report, the intensity of investigations, interagency coordination involved, study responsibilities, scheduling, and funding arrangement. In Colorado, the Soil Conservation Service and other federal agencies are currently eng-aged in flood haz-ard studies in cooperation with the Colorado Water Conservation Board. As Coordinator for all water studies in the -state, the Colorado Water Conservation Board establishes priorities and schedules these studies on a. priority ±asis. The Colorado Water Conserva- tion Board and the _Soil Conservation Service entered into a joint coordination agreement for flood hazard analyses on January 27, 1972. The Soil Conservation service, United States Department of Agri-culture, carries out flood hazard analyses under the -authority -of Section 6 of Public Law B3-566, Recommendation 9(c) Regulation of Land Use of House ]Document No. 465, 89th Congress, 2nd Session and in compliance with Executive -Order 1129-6, dated August 10, 1966. STUDY AREA The area of study includes the flood plains of Coal Creek and Rock Creek. The study begins at the Coal Creek confluence with -Boulder Creek and extends upstream for a distance of 14 miles to a point about 0.4-mile above the town of Superior. Rock Creek is a tributary to Loal Creek and the -study -area extends from its mouth upstream about 5.4 miles to the Denver-Boulder Turn- pike (see Attachment 1). Located primarily in the -southeast part of Boulder County, -the watershed drains about 79 square miles. Parts of the drainage area lie within Jefferson, Adams, and Weld Counties. Coal Creek flows in a northeasterly direction until it enters into Weld Lounty and -then flows north past the town of Erie where it crosses back into Boulder County and runs into Boulder Creek. Boulder Creek flows into St. V_rain Creek, a major tributary to the South Platte River. About 9.5 miles of the Coal _Creek study reach is in Boulder County and -the remaining 4.5 miles in Weld County. All of the Rock Creek study reach (5.4 miles) is in Boulder County. The flood plains -vary in width from about 500- 700 feet in the upper reaches, to about one taif of a mile in the lower areas. t t CONTENTS • Page INTRODUCTION 1 STUDY AREA 1 OBJECTIVES 2 INTENSITY OF INVESTIGATIONS 2 INTERAGENCY COORDINATION 2 ATTACHMENT 1 3 STUDY RESPONSIBILITIES 4 REPORT PREPARATION AND CONTENTS 5 SCHEDULING 6 FUNDING 6 ATTACHMENT 2 7 SIGNATURES 8 OBJECTIVES • The primary objective of this study is to prepare flood plain maps so that Boulder and Weld Counties can develop flood plain zoning ordinances and other land use controls, as needed, to reduce potential flood damages and unwise development in the flood plain. The engineering and hydrologic informa- tion to be developed during the study will be of use in developing a master drainage plan, in road and bridge -planning and design, in planning channel modification, and in the planning of flood control structures, if needed. INTENSITY OF INVESTIGATIONS Studies will be undertaken to develop flood hazard information for the 10-, 25-, 50-, I00-,' and 500-year frequency floods under existing channel and flood-plain conditions with runoff factors adjusted to reflect future urbaniza- tion. Photogrammetric maps with topographic and flood plain information for the 100- and 500-year frequency Iloods will be prepared on a scale of 1" = 400' with a contour interval of four feet and two feet interpolations. Available basic data such as flooding history, photos, land use, and exist- ing survey data will be collected. Pertinent data from this information will be used in the study. Engineering field surveys will be conducted to establish vertical and horizontal ground control and to obtain dimensions of bridges and culverts. About 110 flood plain cross-sections will be needed to adequately define the hydraulic relationships. Cross-section data will-be obtained photogrammetri- cally where feasible. The magnitude, elevation, and location of flooding for the designated fre- quency floods will be developed from hydrologic and hydraulic analyses using standard Soil Conservation Service techniques and procedures. The Water Resources Council -tentative guidelines for flood -hazard eval- uations will be used for recommendations on flood plain land use and manage- ment regulations. INTERAGENCY COORDINATION Close coordination will be maintained through the representatives of the Colorado Water Conservation Board, Boulder County, Weld County, Urban Drainage and Flood Control District, and the Soil Conservation Service to assure the completion of the study in a timely manner. Coordination with the Corps of Engineers and other concerned federal agencies will be main- tained throughout the study by the Colorado Water Conservation Board. 2 C (i \ Canfield ____,..r.„. gouider Cni Erie j287j (o, rv' :i Ic-- V 7 WELD CO. LAFAYET E j� 1 ADAMS CO. /0E. LOUISVILLE/ /36 g0 °<o / '� / Ci PR r \Study Area Superior Boundary �'/ Creek \ /� 287 Creek r � T'434,,c, ' G°°l:' R°°K i�� BROOMFIELD �� BOULDER CO. JEFFERSON CO_ 3: I APPROXIMATE SCALE : I/2" = I MILE 1 • LOCATION MAP COAL CREEK a ROCK CREEK Boulder and Weld Counties, Colorado ATTACHMENT I 3 STUDY RESPONSIBILITIES The CotoAndo Wctex Conaenva-tLon Boaxd 1. Provide leadership in coordinating all activities. 2. Contribute financial assistance toward the cost of the study. Boulder and Weld Countiea, and the Utban DAaLnage and Flood Control DL6.tk-Lc,t uu,2C: 1. Provide aerial photographs and targets for the study area (see Attachment 1 - Location Map for approximate area of coverage. ) Letting of contracts and payments to the contractor for this work is the sponsor'-s ses- ponsibility. Aerial photography and target placement will±e performed in accordance with Soil Conservation Service specifications. Sample agreements including the specifications will be provided by the Soil Conservation Service. 2. Secure all necessary rights of ingress and egress for the placement of targets -and engineering field surveys. 3. Provide survey crew assistance - one field man for approximately 25 workdays. 4. Provide funds for scribing topographic information an photogrammetric maps. 5. Provide maps showing estimated location and density of future urbaniza- tion and upstream watershed development for use in estimating runoff factors. 6. Provide funds for one set of film positives (flood plain maps), and for printing 600 copies of the Flood Hazard Analyses Report and 600 copies of the Technical Supplement. 7. Provide meeting room facilities for presentation of final report. The Soil Conaeiwati.on Service 1. Conduct engineering field surveys for ground control following the completion of aerial photography and target contracts. 2. Prepare photogrammetric base maps of the flood plain study area. 3. Conduct hydraulic and hydrologic studies, and develop water surface profile and cross-section data. 4. Develop photogrammetric maps with flood plain delineations for the 100- and 500-year frequency floods. Flood plain delineations will be based on existing channel and flood plain conditions with runoff factors adjusted to reflect projected future urbanization. 5. Provide one set of film positives suitable for reproducing working copies of the flood plain maps on a scale 1" = 200' . 4 t 6. Prepare technical supplement including water surface profile drawings, and cross-sectional data in t-abular form. 7. Compute a theoretical floodway capable of carrying the 100-year dis- charge at an increased rise in water surface elevations of one-half foot and one foot above the pre-floodway water surface elevation. Floodway dat-a will be in tabular form and keyed to cross-section _stationing and elevations. This information will be separate to the main report and will ±e presented to the sponsors in letter form with attachments. 8. Prepare Flood Hazard Analyses Report for publication. REPORT PREPARATION AND CONTENTS A preliminary draft of -the report on the study will be prepared by the Soil Conservation Sexvice end submitted for review to the officials of Boulder and Weld Counties, the Urban Drainage and Flood Control District, and the Colorado Water Conservation Board. After reviews are made, -a final copy of the cooperative report will be prepared for publication. The report will include the following: I. An introduction giving background information on authorities and reasons for the study. II. A discussion of historic and current flooding, and flood -plain conditions. III. A section on sources of data and methods used in the analyses. IV. Narrative describing the results of -the study. This section will include exhibits of water surface pro- files and representative cross-sections for the selected flood frequencies. V. Photogrammetric maps with flood plain delineations for the 100- and 500-year frequency floods. Note: Due -to the bulk and size of large scale maps, the flood plain maps may be bound separate to -the main report. VI. Interpretations and recommendations for appropriate flood plain land use and management. Suggestions for reducing potential flood damages. The size of the reports will be 11" x 8-1/2", or 11" x 17", or a combina- tion of the two. 5 i SCHEDULING Scheduling -of the major activities will -be as shown on Attachment 2. There are several -elements involved in each activity and work will be done concurrently between activities. It is expected, however, that the duration of the study would not exceed 15 months and that the report should be _ready =or publication by July 31, 1975. FUNDING The total estimated cost for the study is $37,700. The costs will be shared by -the local sponsoring organizations and the Soil Conservation Service. The following are cost shares: Local Sponsoring Organizations - Costs Colorado Water Conservation Board $ 6,500 Boulder -and Weld Counties 3,250 Urban Drainage and Flood Control District 3,250 Total $13,000 The Sail Condphvat on SenviCe cost share is $24,700. The Soil Con-erva- tion Service will conduct this flood hazard analyses under authority of Section 6 of Public Law 83-566. Funding for -the Flood Hazard Analyses Program is through regular agency appropriations. Cost estimates -are based on items listed under the section Study Responsibi- lities in this Plan of Study. Itemized cost estimates are shown below: Item SCS Cost _Sponsors' Costs (Dollars) (Dollars) Aerial Photographs and Targets 0 6,100 Engineering Field Surveys 3,200 600 Photogrammetric Mapping and Topographic Scribing 12,500 800 Technical Studies 7,000 0 Computer Services 1,-200 0 Printing Preliminary Report 400 0 Film Positives and Final Report Printing 0 4,000 Other Personnel Services 0 1,500 Travel 400 0 TOTAL 24,700 13,000 6 ) ti CSC N E $4 O J 4-1 u ,O u w CO ti C.1 C) • x 411 w co W rn W W r 4-4 cn a C% O .-1 0 w w 6 6 6 0 N O W x . U W U tO 47 CO O U r O E+ • W 6 O H U 6 C) h ro 0 G C) E v C) C u ro O Cu o 5-1 PO ri a0 „ 4-4 u ri u u C eo o ,O Cu• .C W E-1 m '-1 Ste+ H Cu O C •.%i .-m i O I H rl o -t p. CO C) O OO ;, 444 4-.$ L 'O O JJ li 43 C) 01 O Cl) O rl 4.) N O O .> C) O u 4-I O w C 0 Cu Cu '- Cu CO CO C) 543 0) V7 $4 CO V C O C) o1 ' rl .-1 b0 m rl i rl rl r1 r1 rl 4) H .C m CI m 0) cd 34 54 al O C) C) rr_i .C U C) m Pa A M C-1 6 6 N 114 H X W W It is mutually agreed that this Plan of Study will be in effect only to the -extent that appropriated funds are available to all four parties. COLORADO WATER CONSERVATION BOARD: By Title Date BOULDER COUNTY: By Title Date WELD COUNTY: By Title Date URBAN DRAINAGE AND FLOOD CONTROL DISTRICT: By Title Date SOIL CONSERVATION SERVICE: By Title Date \` 8 W 1 N . , cc 5 z <L W W0 2 0 W w o 0 \ .,1 m_ r _ O / A 1 _ ,,,' : . -- g � n A 'rrr — 7 a E U '- //'(, , r TQ ��) �� J A_ uo _k ✓ _/ }-� i- inin-'\i-1 ±-1-1[--r_ili-j) , ,/ !. - - [. , dz-I /,, :F=t-r-- `-..TV „,„/ - ' -,- AV� V�� \\ �� .[,„,\ �\ ,\-,.\\\ Ali\ K \ ! ''a�,;AVA''.�- A� ��\\�\� \ 6-ii-li:..:_.__ \�� `�. 1,. N.--- -'''- -'• \\'. '",-. it , \ I ,A'l ii 1 t _____ii,, I \ , ':,-, , R I VI • // !a t / Lz—►1. r`^- STATE OF COLORADO ss. COUNTY OF WELD lied with the Crlerk of the Board of County Commissioners APR 1 5 1974 - -- COUNTY CIC RK AND RECORDER FLOOD HAZARD ANALYSES By__ Deputy Coal Creek and Rock Creek Boulder and Weld Counties . Colorado Plan of Study • • • J'repared by the COLORADO WATER CONSERVATION BOARD _BOULDER COUNTY WELD COUNTY • SOIL CONSERVATION SERVICE, USDA • February 1974 • • 'RELDITNARY DRAFT FOR REVIEW February 19712 CONTENTS -Page • INTRODUCTION 1 STUDY AREA 2 OBJECTIVES 2 ATTACHMENT 1 3 INTENSITY OF INVESTIGATIONS -4 INTER-AGENCY COORDINATION 5 STUDY -RESPONSIBILITIES -- 5 -REPORT PREPARATION AND. CONTENTS 6 SCHEDULING 8 ATTACHMENT 2 - 9 FUNDING - 10 SIGNATURES 12 277 974 • INTRODUCTION This _flood hazard analyses plan of study for Coal Creek and Rock Creek was jointly prepared by the Colorado Mater Conservation Board, the County Commissioners of Boulder County and Weld County, Colorado and the -Soil Con- servation. Service. The purpose of the Plan of Study is to describe the objectives of the study, the intended uses of the data and _report, the intensity of investigations, interagency coordination involved, study responsibilities, scheduling, and funding arrangement. In Color-ado the Soil Conservation Service, as well as several other federal agencies, is currently enga`ted in flood hazard -analyses in coopera- tion with the Colorado Water Conservation hoard, as part of a unified � national program for reducing flood losses, and in accordance with Recom- mendation 9(c) of the -Task Force on-Federal Flood Control Policy. This program -was sent by the President to Congress in August 1966, and is printed -as House -Document No. 465 of the _89th Congress. In the interest of coordination with other agencies and for the purpose of developing, information to _comply -with the recommendations of House Document _No_. 465, the Soil Conservation Service has -developed a joint coordination agree- ment-with the Colorado Water Conservation Board. This cooperative flood hazard -analyses will be carried out under the authority of Section 6 of the Watershed Protection and Flood Prevention Act, Public Law 83-566. 2 STUDY AREA The area of study includes the flood plains of Rock Creek upstream -from the -Boulder Creek confluence to a point approximately 0.4-mile above the town of Superior, a distance of 14 miles, and Rock Creek, a tributary stream, from its mouth stream about 5.4 miles to the Denver-Boulder Turn- pike (see Attachment 1)'. • -Located primarily in the southeast part of Boulder County, the water- shed drains about 79 square miles. Parts of the drainage area lie within Jefferson, Adams, and Weld Counties. Coal Creek flows in a northeasterly direction until it enters into Weld County and then flows north past the town of Erie where _it crosses back into -Boulder County and runs into _Boulder Creek. Boulder Creek flows into St. Vrain Creek, a major tribu— tary to the South Platte River. About 9.5 miles -of the Coal Creek study reach is in -Boulder County and the _remaining 4.5 miles in Weld County. All of the stock Creek study teach (5.4 miles) 'is in Boulder County. The flood plain varies in width from about 500-700 feet in the upper reaches, to about 0.4 of a mile in the lower areas. 277 977 _OBJECTIVES The primary objective of this study is to develop a flood plain map in sufficient detail so that Boulder and Weld Counties can develop flood plain zoning ordinances and other land use controls as -needed to reduce potential flood damages and unwise development in the flood plain. The engineering and hydrologic information to be developed during the study 0i - k \ __,,--N. paid." \ Boulder Erie iJ/ i28i / I• / /BOULDER 1—%, 7nV% WELD CO. LAFAYET % ADAMS CO. A42 icGl�"�� J oFti� LOUISVILLE �. !/ oG--IN 42<udy Area\Y�� 1/ I i Superior ; Boundary i fte Creek • 22871 Creek TO 1 4 k% i BROOMFIELD ry /y BOULDER CO. /A JEFFERSON CO.. \ 3= I 1 APPROXIMATE SCALE : I/2" = I MILE . i LOCATION MA-P COAL CREEK 8 ROCK CREEK Bouldtrand Wekd Counties, Colorado ATTACHMENT I 3 9 i4Objettives (contd) will be of use in developing a master drainage plan, -in road and bridge planning and design, in planning channel modification, and in the plan- ning of flood control structures, if needed. INTENSITY_OF INVESTIGATIONS Studies will be undertaken to develop flood hazard information for the l0-, 25-, 50-, 100-, and 500-year frequency floods under present conditions and with expected future development of the area. Composite aerial mosaics with topographic and flood -plain information for the 100- and 50O-year frequency floods under present conditions will be prepared on a scale of I" - 40O' with a contour interval of four feet and two feet interpolations. Available basic data such as flooding history, _photos, land use, and existing survey data -will be collected. Pertinent data from this informa— tion will be used in the study. Field -surveys will be conducted to establish vertical and horizontal control and to obtain dimensions of bridges and culverts. About 110 flood plain cross—sections will be needed to adequately define the hydraulic relationships. Cross section data will be obtained photogrammetrically where feasible. The magnitude, elevation, and location of flooding for the designated frequency floods -will be developed from hydrologic and hydraulic analyses using standard Sail Conservation Service techniques and procedures. S 1Flntensity (tontd) The Water Resources Council tentative guidelines for flood hazard evaluations .will be used for recommendations on flood plain land use and management regulations. INTER-AGENCY COORDINATION Close coordination will be maintained through the representatives of the Colorado Water Conservation IBoard, IBoulder County, Weld County and the Soil Conservation Service to assure the completion of the study in a timely manner. Coordination with the Corps of -Engineers and other concerned federal agencies will he maintained throughout the study by the _Colorado Water Conservation Board. STUDY RESPONSIBILITIES The Colorado Wa te4 Conti eAvat i..on Board uci eQ.: 953 373 - 1. Provide leadership in -coordinating all activities. 2, Contribute financial assistancetoward the cost of the study. 8ouedeA and Wald County.-v win: 1. Provide aerial photographs and targets for the study area (see Attachment 1 - Location Map for approximate area of coverage) . 2. Provide necessary rights of ingress and egress for field surveys. 3. Provide survey -crew assistance — one field man for approxi- mately 3&work days. zr ..&-Study (sontd) 4. Provide funds for printing the final draft of the Flood Hazard Analyses Report. 3. Provide meeting _room facilities for presentation of final -report. b. Provide estimates of future flood plain and upstream Matershed 'development for use in estimating future flooding. The Sail Caneenvati.on Sawdce tale: 1. Develop aerial photographic maps suitable for use in the study. Composite aerial mosaics will be on a scale of 1" = 400' with a contour interval of four feet and two feet interpolations in the flood plain areas. 2. Conduct hydraulic and hydrologic studies and develop water surface profiles for the 10-, 25-, 50-, 100-, and 500-year frequency 'floods. 3. Develop representative cross-section data with flood plain information for existing and future conditions. 4. Develop flood plain maps for existing conditions. 5. Prepare flood Hazard Analyses Report fo= publication by Boulder and Weld Counties. REPORT PREPARATION AND _CONTENTS • A preliminary draft of the report on the study will be prepared by the Soil Conservation Servine and submitted for review to the 'officials of -Boulder and Weld Counties, and the Colorado Water Conservation Board. 4r4Report (contd) After reviews are made, a final copy of the cooperative report will be prepared and submitted to the local sponsors in a form suitable for publi- cation. 953 375 The report will include the following: T. An introduction giving background information on authorities and reasons for the study. II. A discussion of historic and current flooding, and flood plain conditions. • III. -A section on sources of data and methods used in the analyses. TV. Narrative describing the results of the study for existing and future conditions. This section will include -exhibits of water surface profiles and representative Cross-sections for the selected flood frequencies. V. Composite aerial _photograph mosaics with flood -plain delineations under existing conditions. Note: Due to the bulk and size of large scale maps, the flood -plain maps may be bound separate to the main report. 11t 4 0 -I'=Report (contd) • VI. Interpretations and recommendations for appropriate - flood plain land use and management. Suggestions for reducing potential flood damages. SCHEDULING • Scheduling of the major activities will be as shown on Attach- ment 2. There are several elements involved in each activity and work will be done concurrently between activities. It is expected, however, that the duration of the study would not exceed 15 months and that the report should be ready for -publication by July 31, 1975.• - - I. a) G O In 7, N Li af C U H .C C U C Li u w d O/ .. W C . O • I" C) Ol • a . O z W n y V ca 41 H a >4 tfl 0G r", U U rn d CO a u aa a In rn bl a Al . N x a "' 0 . o Uo 4. d . U H 7 .' ] .U d 01 0 0 I" T '0 z .0 - - C w a '0 . M CO U .d H o0,-I °' M m 4-i 44 d u y 00 O A O .0 P. H W ,-I I-i 1-4 O. Cl 0 0 1 1.. M O •0P. CC Cla 00 01 S. M O O 'T L L L 'CJ O I:4 44 44 1.1 O 0 O U U CO O M L y. > H. t O 1] W 0 a a I. to "' HN fr.. N H S N CO i. 0] U. 0 a d 0]v-I H 00 ,i I 10 Cd 'O O O C .-I L > H i ,4 H v-I L H .C 01 01 CO CU Cl H 1. O) O U U 0.a H W a O) Cl +i .C N CJ "-I "-I6 G W P. -. z f=. W I 953-366 /0 FUNDING Boulder County will contribute $ and Weld County $ for the study, including funds for aerial photographs and targets, and printing costs for the final reports. They will also be respon- sible for furnishing field survey assistance needed in establishing the vertical and horizontal _control for.photogrammetric plotting and preparation of aerial mosiacs. Other -personnel services include obtaining rights of ingress and egress for field surveys and projec- tions of future land use. The Colorado Water Conservation Board will contribute $ for the study to be used in conjunction-with the Counties' funds for aerial photographs and report printing costs. The Soil Conservation Service will conduct this flood hazard study under authority of Section 6 of Public Law 83-566. Soil Conservation Service funding for the Flood Hazard Analyses Program is through their regular agency appropriations. I/ w The estimated costs for the study are as follows: Item SCS Cost Sponsor's Costs (Dollars) (Dollars) Aerial Photographs and Targets 0 6,100 Engineering Field Surveys 3,200 600 Phot'ogrammetric Plotting and Aerial Mosaics ' 12,500 0 Technical Studies 6,000 0 Computer _Services 1,200 0 • Printing Preliminary Report 400 0 Printing Final Report 0 3,800 Other Personnel Services 0 1,500 Travel 400 0 Total • 23,700 12,000 O l0- It is mutually agreed that this -Plan of Study will .he in effect only to the extent that appropriated funds are available to all lour parties. Colorado Water Conservation Board: By Title Date Boulder County: By - Title.. . Date Weld County: By Title Date . . . . Soil Conservation Service • • By Title Date .. • ,_. _... . <.;. _.... >. ,.•..-.,..::'.r�`•:::fit"' _.«. ,::r.•.. ..5`.-.'Ju4s:ai-.a:.•:c::.:c;.•.•.s::,.�+:�N.%!^x:�.>tTf'.i�h�iar. . e " _ trill '7 / (t 'Nigr,,,, a\ OFFICE OF THE PLANNING COMMISSION BURMANLORENSON PLANNER PHONE(303) 353-2212 EXT.227,228& 229 COUNTY SERVICES BUILDING GREELEY.COLORADO 80631 we COLORADO � STATE 6a. COUNTY OF WELD tired with the Clark of the Board of County Commissioners May 2 , 1974 ANA 1974 hft...�ia re,mm. Mr . Don Bressler Its-_ DeWitt Colorado Water Conservation Board 102 Columbine Building 1845 Sherman Street Denver , Colorado 80203 Dear Mr . Bressler: To confirm our previous conversation concerning the Weld County Commissioners ' resolution on the Coal Creek and Rock Creek Flood Hazard Analyses proposal , the County Commissioners have approved our participation in the project to the extent of in-kind services of $775 . 00 that we have pre-agreed to . The Commissioners did make it subject to one additional stipulation : That topography b-e done to a one foot contour interval adjacent to all bridges across the flood plain area . I am sending landownership maps as agreed as our first steps to satisfay our requirements of the agreement . Please notify us when our field man will ba required and a generalized scheduling of his time . Sincerely , Burman Lorenson Planning Director BL/lj Enclosures cc : Chairman , Weld _County Commissioners Rich Kerbel , Boulder Co . Engineering Dept . WELD COUNTY COMMISSIONERS HARRY S.ASHLEY GLENN K. BILLINGS 074/1/51 ROY MOSER ` OFFICE OF BOARD OF COUNTY COMMISSIONERS PHONE (303) 353-2212 EXT.221,222& 223 !!r•'. P.O. BOX 758 /�;} GREELEY,COLORAOO 80631 • COLORADO • March 21, 1974 Mr. Larry Lang c/o Colorado Water Conservation Board • 1845 Sherman Street Denver, Colorado 80203 Dear Mr. Lang, This letter is to reaffirm our sense of priority regarding the Cache La Poudre Flood Plain Study, financed in part by the counties of Larimer and Weld and the cities of Fort Collins and Greeley. We emphasize our desire that all phases of the study area agreed upon be completed prior to the initiation of any other studies in our area which may interfere with or delay this project. It has cane to our attention that phase III of this project, the -area between Fort Collins and Greeley, may have been delayed in favor of a study along the Little Thompson River. If such is the case, we would appreciate any information you may have as to the reasons and again stress our priority. Regards, \ r 3 Harry S. Ashley, Chairman Boar , sf Weld Count�yyjlCCommissioners rt ti=mot✓ l l'l Glenn K. Billings, Commissioner, Weld County Board of Commissioners Chairman, Larimer-Weld Regional Council of Governments Richard D. MacRavey, Director, Larimer-Weld Regional Council of Governments WELD COUNTY COMMISSIONERS HARRY S.ASHLEY GLENN K. BILLINGS ROY MOSER Larry Lang c/o Colorado Water Conservation Board 1845 Sherman Street Denver , Colorado 80203 Dear Mr . Lang : This letter is to reaffirm our sense of priority regarding the Cache La Poudre Flood Plain Study , financed in part by the counties of Larimer and Weld , -anil the cities of Ft . Collins and Greeley . We emphasize our desire that all phases of the study area agreed upon be completed prior to the initiation of any other studies in our area which may interfere with or delay this pro- ject . It has come to our attention that phase III of this project , the area between Ft . Collins and Greeley , may have been delayed in favor of a study along the Little Thompson River . If such is the case , we would appreciate any information you may have as to the reasons and again stress our priority . / /L ! / %� � URS / THE KEN R. WHITE COMPANY Mailing Address P.0 Drawer 6218 • Denver Colorado 80206 3955 East Exposition Avenue • Suite 300 - Denver, Colorado - 303/744-1861 A URS Systems AtPoute February 19 , 1974 United Minerals , Ltd. 4643 Wadsworth Wheatridge, Colorado 80033 Attention: Mr. Robert Jensen Re: Extended Flood Plain Analysis Cache La Poudre River KRW No. : 4037 Dear Mr . Jensen: The attached report prompted by findings of an earlier study, is submitted as supplementary thereto and deals with the effect of two alternate dike locations on the existing flood profile. Placing the dike away from the river and diagonally across the property has a lesser effect on the existing profile than modi- fying the south bank but in so much as the dike is still located in the flood plain a certain amount of channelization will be required to accommodate the displaced flow. We trust your planning needs will be met by this additional information. Very truly yours, URS/THE KEN R. WHITE COMPANY Ben Urbonas, P.E . Project Manager BRU/SMcG:kjh Attachment: Extended Flood Plain Analysis EXTENDED FLOOD PLAIN ANALYSIS CACHE LA POUDER RIVER (EAST GREELEY) for UNITED MINERALS, LTD. by URS/THE KEN R. WHITE COMPANY DENVER, COLORADO February, 1974 EXTENDED FLOOD PLAIN ANALYSIS This extended study of the flood profile of the Cache La Poudre River east of Greeley, Colorado, has been pro- vided for the use of United Minerals , Ltd . ; Wheatridge, Colorado. Earlier studies revealed that diking the south bank adjacent to the river would substantially alter the flood plain as calculated by the U . S . Army Corps of Engineers for a 100-year flood (approximately 10 , 000 cfs) . In an effort to maintain the existing flood profile as estab- lished , it was concluded that placing the dike on the south bank would require extensive channelization to accom- modate the displaced flows, and that locating the proposed dike farther from the river and out of the flood plain where possible should be considered . The flood plain boundary resulting from the dike along the south bank is included in this report as figure number 1 . Two alternate dike alignments were proposed and the report extended to provide an analysis of the flood plain with the dike structures relocated. The proposed dike loca- tions were identical except that for alternate number one the dike was placed along the north edge of an exist- ing pond and for alternate number two the dike was located along the southern edge, as indicated on figure number 2 . -1- In so much as both routes produced very similar mean sur- face level, and due to the somewhat more desirable location of the northern route, the dike location for alternate number two should be dropped from consideration. Locating the dike away from the river as originally pro- posed and diagonally across the property results in a flood profile only slightly higher than the mean water surface level calculated for the existing flood plain. This route, in conjunction with approximately 1 , 200 feet of channelization between sections 20 and 24 , and a sec- ondary channel adjacent to the dike between section 24 and 25 produced a profile at or near that of the existing basin (figure number 3) . The backwater curves calculated for the various conditions are summarized in Table 1 . Although the secondary channel assumed between sections 24 and 25 is somewhat excessive and could be reduced in width, alternate route number one with channelization offers the most satisfactory solution. It is also contin- gent on re-aligning and widening the river between section 20 and 24 and clearing the area between the proposed dike and the river of all trees and obstructions. The exact location of the secondary channel is unimportant and the location near the dike permits convenient use of the mat- erial removed from the secondary channel for the construc- tion of the dike. For study purposes , the river was widened -2- TABLE I MEAN WATER SURFACE (100-Year Flood) • SEC . EXISTING MODIFIED ALT. ALT. ALT. NO. 1 NO. CORPS* KRW* BANK NO. 1 NO. 2 w/CHANNELIZATION 15 4613 . 6 4613 . 6 4613 . 6 4613 . 6 4613 . 6 4613 . 6 16 4615 . 6 4615 . 9 4615 . 9 4615 . 9 4615 . 9 4615 . 9 17 4617 . 1 4618 . 2 4620 . 2 4618 . 1 4618 . 1 4618 .2 18 4617 . 4 4618 . 4 4622 . 8 4618 . 0 4618 . 0 4618 . 3 19 4619 . 0 4919 . 4 4623 . 8 4619 .2 4619 . 2 4619 . 3 20 4620 .1 4620 .3 4624 . 3 4620.1 4620. 1 4620 . 0 22 4621 . 5 4621. 7 4624 . 8 4622 .1 4622 .1 4621 . 1 23 4622 . 5 4622 . 7 4625 . 6 4624 . 0 4624 . 0 4622 . 8 24 - 4623 . 7 4626 . 5 2624 . 8 4624 .7 4623 . 6 25 4626 . 3 4626 .1 4627 . 5 4626 .3 4626 . 0 4624 . 5 26 4627 . 5 4627 . 3 4628 . 0 4627 .2 4627 . 0 4625 . 9 27 4628 .1 4628 . 4 4629 . 0 4628 . 4 4628 . 3 4628 . 1 30 4630 . 1 4630 . 4 4630 . 7 4630 . 5 4630 . 5 4630 . 5 * Taken from previous reporting. -3 to approximately 140 feet and the width assumed for the secondary channel was 100 feet with a bottom elevation 1 foot higher than the existing river bottom at that section . Complete site development with the proposed ultimate gravel removal from the site should result in a substantially more efficient flood plain. This will further reduce the flood inundation areas in the future. It is therefore concluded that implementing the flood plain development as shown on figure 3 will result in no additional (and possibly less) flood hazard along the affected reach of the stream. It is recommended that the recommended dike be constructed with a minimum freeboard of two feet above the flood ele- vations shown at each cross section to insure against flood damage to the railroad tracks . C Prepared by: ' "' ' + BenTUrgbonnaals,, P.E. Ciae,tie F C`-- Stu McGuire , P.E. -4- DEPARTMENT OF THE ARMY OMAHA DISTRICT, CORPS OF ENGINEERS 7410 U. S. POST OFFICE AND _COURT HOUSE OMAHA, NEBRASKA 68102 16 December 1971 ANNOUNCEMENT OF PUBLIC MEETINGS ON FLOOD AND OTHER RELATED WATER RESOURCES PROBLEMS FOR THE BIJOU CREEK BASIN, COLORADO SCHEDULE OF MEETINGS Time: 10:00 a.m. , M.S.T. 3:00 p.m. , M.S.T. Date: 14 January 1972 14 January 1972 Location: Community Hall Deer Trail School Wiggins, Colorado Deer Trail, Colorado The Congress of the United States in resolutions adopted by the Committee on Public Works of the United States Senate, on 14 June 1956 and 22 March 1971, directed the Corps of Engineers to study the water resources and related problems in the South Platte River basin and tributaries, Colorado, Wyoming, and Nebraska. On 10 December 1969, the Corps of Engineers held public meetings in the Community Hall at Wiggins, Colorado and in the school at Deer Trail, Colorado. These meetings were held to discuss the flood and other re- lated water resources problems in the Bijou Creek basin, to present the Corps of Engineers' potential plan for water resources development to solve these problems, and to obtain the views of local interests on the potential plan of improvement. In the Bijou Creek basin, the plan of improvement included the con- struction of two dams on East Bijou Creek, a dam on Muddy Creek, and a dam on West Bijou Creek. After the public meeting, the report was finalized and forwarded to higher authority for review. During the period the report was under review, changes occurred in economic indicators, interest rates, and construction costs. In view Gf these changes, the report is now being revised and updated. Our current findings indicate that the two dams on East Bijou Creek and the dam on Muddy Creek are no longer feasible under the present criteria established for water resources development. In view of these findings, the Corps of Engineers will hold another public meeting to present the revised -plan of improvement and to answer questions you may have concerning it. The final conclusions and recommendations will not be formulated without full consideration of the views of the interested parties obtained at these meetings. All interested parties are invited and urged to be present or represented at these meetings. All _parties will be -afforded full -opportunity to express their views and furnish specific data on matters pertinent -to this study. Oral statements will be heard but, for accuracy of record, all important facts and statements should be submitted in writing. Written statements may be handed to the presiding of₹'icer at the meeting or may be mailed beforehand to the undersigned at the Corps of Engineers' address in the letterhead. All statements, both oral and written, will become part of the official written record of this study and will be made available for public examination. Please bring this announcement to-the attention of all persons you know to be interested in -the Bijou Creek basin. /9)1 B. R. PENDEBGRASS Colonel, torps o ngineers District Engineer 2 ENGINEERING � . r ° NELSON, HALEY, PATTERSON AND QUIRK, INC. 1 CONSLI.LTANTS , 2021 CLUBHOUSE DRIVE GREELEY. COLORADO 80631 PHONE 303-. 353.6244 September 24, 1971 Board of County Commissioners Weld County Weld County CourtHouse Greeley, Colorado 80631 Gentlemen: For several years the cities of Greeley and Fort Collins, along with the counties of Weld and Larimer, have recognized the flood damage Potential of the Boudre River. Over a year ago, they requested the U.S. Army Corps of Engineers to develop a flood-plain study of the river and provide recommendations for preventive measures. The Corps of engineers have agreed to perform the study if the entities involved provide the topographic information necessary. Recently, we were asked by the Weld -County Planner, Mr. Burman Lorenson, to quote to him a cost of providing this topographic information. He related that he had already received a quotation from the U.S. Soil Conservation Service in -Portland, Oregon for the services. He outlined the specifications for the work exactly as the SCS proposed and, based upon the identical criteria, we submitted a lump-sum figure. We have been informed by our Congressional delegates that U.E. Department of Labor policies prohibit federal agencies from competing with private enterprise except in areas where such services are unavailable. Yet here we find ourselves in such competition. Mr. Lorenson has informed us, on this date, that he has decided to accept the SCS proposal, -even though their price is slightly higher than ours. His only -apparent reason for this -action is that to do otherwise would necessitate the reconsideration of the governmental entities involved in Weld -and Larimer Counties. Mr. Norm Gan, of the Omaha District, U.E. Corps of Engineers, has expressed his willingness to accept our services after reviewing the work performed _by us earlier on the Poudre River where it endangered land belonging to Kodak of Colorado. OFFICES IN GREELEY, GRAND JUNCTION AND DENVER, COLORADO Board of County Commissioners - 2 - September 24, 1971 Weld County Nelson, Haley, -Patterson and Quirk, Inc. , a Colorado firm, strongly resents this competition of a seder-al agency with _local private -enterprise. We sincerely hope that the County of Weld will not become a part of a _plan to spend more Colorado dollars out-of-state -than the same services will cost here. Very truly yours, a NELHLEY, PATTERSON and QUIRK, INC. Saregare William D. Patterson, P.E. Vice-President WDP:llr LCr. ; V;1,Eti CuUNTY PLANNING :C;O .._. ..-:,;ON • FORT COLLINS, COLORADO 80521 PHONE 484-1303 September 15, 1971 P.o. 30x2137 • Burman Lor-enson Weld County -Planning Office Services -Building Greeley, Colorado 80632 Dear Burman: Enclosed is the letter to the State Water Conservation Board regarding the flood plain study. I have talked with our County Commissioners and they would prefer to go with the contract we already have rather than negotiating .a new one with N.h.P.Q. Sincerely, ,/ v IA • Dwight Whitney DW/kl Director of Planning r a c.rc n, 11 11 L'� it r c� -n ((/',� �,r I-a LL J�L�,rW �2Y1.. {. %AOC �� LO�WY ^ �� \ n1/I'I1'rI L ^c�s�rV�Y YJ YLW Y JJ September 3 , 1971 Felix Sparks Colorado State Water Conservation Board 1845 Sherman Denver , Colorado Dear Mr . Sparks : The Larimer-Weld County Planning Commission , acting for the included jurisdictions of Lorimer County , Weld County , City of Fort Collins and the City of Greeley , hereby re- quests you to proc-ess this application to the Army Corps of Engin'eers for preparation of a Flood Plain information report for the Cache La Poudre river from LaPort to the confluence of -the Platte River . We would request that the study show the 50 and 75 year flood plain , as well as th-e 10D year flood plain . Two previous requests were made , one by Fort Collins , and one by Weld Cogan-ty and Greeley . The new request would en- comp-ass both previous requests and also include Larimer County . The four agencies , through the Regional Planning Commission , would pay $22 , 500 . 00 during 1972 to the Soil Conservation Service to compile the nee-ess-ary preliminary information to hav-e the Flood Plain study done . The information supplied will bQ as follows : 1 . Horizontal , vertical and all other controls neces- sary for photogrammetric plotting 2 . Cross section information in tabular form (approxi - mately 200 cross suctions ) 3 . Composite film positive of the topographic inform- ation on a photographic base . Scale 1 " — 200 ' contour interval 4 feet 4 . Overl-ay of the topographic map showing cross section location and alignment with location of zero station for each cross section Pasr OFFICE BOX 2137/ FORT COLLINS, COLORADO 30521 /434-1303 ._ .\ . ._ � � ,'r„�. . � . ,�. . v, r j1/4„0", -2- __— The Regional Planning Commission will publicize and distribute the Flood Plain information when received . For this purpose we will require three volumes contain- ing the reports with -the following priority : . Volume 1 - Canyon mouth to the confluence of Spring Creek Volume 2 - Sheep 's Draw to the confluence of the Platte Volume 3 - The remainder of Larimer County and Weld County to Sheep ' s Draw Volume 1 and 2 are requested to be completed by the end of 1972 and Volume 3 as soon as possitle after that . The -Regional Planning Commission will require 50 copies of Volume 1 and 2 and 100 copies of Volume 3 of the standard format, report for planning and lending agencies and 2000 copies of the map -flier of each vo me for public distribution . City of Gree ey �=-*— �`�`cc-7/ C� ty, of Fort Lol l ink l � , ` ��,. ;if 7/ Wel d Count" /'7r � %�C,; w, Larimer County `0 1-Lavrioner-Weld Regrona Planning Commission POST OFFICE 2OX 2137/ FORT COLLINS, COLORADO 20521 /484-1 :403 COLLC.:A T.0 = p_ a a- _•z_NJ= 3m Z'. _ o O- m=:d W a O W W tf= Io=� �W- * .,7%.,,,,. ter ' 1 ,.- moo= a- ' • . 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UPS if THE 1...e. tt4 f . WHITE COMPANY •,� k` v ""4: FLOOD PLAIN STUDY `k ,.. cj m,;tx�>'5; c4 y§ $ UNITED MINERAL , LTD. a �'�+>n' e•Ct...;•'ti2c ,'6 ?l�q vi;1<i '..si*,q;tit:', Hello