HomeMy WebLinkAbout20192217.tiffFederal Emergency Management Agency
Washington, D.C. 20472 RECEIVED
October 22, 2019
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
The Honorable Barbara Kirkmeyer
Chair, Weld County Board of Commissioners
P. O. Box 758
Greeley, CO 80632
Dear Ms. Kirkmeyer:
OCT 2 8 2019
WELD COUNTY
IN REPLY REFER TO: COMMISSIONERS
Case No.: 19-08-0635P
Community Name: Weld County, CO
Community No.: 080266
FIRM Panel Affected: 08123C1225E
116
In a Letter of Map Revision (LOMR) dated May 28, 2019, you were notified of proposed flood hazard
determinations affecting the Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report
for Weld County, CO. These determinations were for Coalbank Creek - from approximately 4,250 feet
downstream of State Highway 14 to approximately 2,800 feet upstream of State Highway 14. The 90 -day
appeal period that was initiated on June 14, 2019, when the Department of Homeland Security's Federal
Emergency Management Agency (FEMA) published a notice of proposed Flood Hazard Determinations
in The Greeley Tribune has elapsed.
FEMA received no valid requests for changes to the modified flood hazard information. Therefore, the
modified flood hazard information for your community that became effective on October 15, 2019,
remains valid and revises the FIRM and FIS report that were in effect prior to that date.
The modifications are pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (Public
Law 93-234) and are in accordance with the National Flood Insurance Act of 1968, as amended
(Title XIII of the Housing and Urban Development Act of 1968, Public Law 90-448), 42 U.S.C.
4001-4128, and 44 CFR Part 65. The community number(s) and suffix code(s) are unaffected by this
revision. The community number and appropriate suffix code as shown above will be used by the
National Flood Insurance Program (NFIP) for all flood insurance policies and renewals issued for your
community.
FEMA has developed criteria for floodplain management as required under the above -mentioned Acts of
1968 and 1973. To continue participation in the NFIP, your community must use the modified flood
hazard information to carry out the floodplain management regulations for the NFIP. The modified flood
hazard information will also be used to calculate the appropriate flood insurance premium rates for all
new buildings and their contents and for the second layer of insurance on existing buildings and their
contents.
If you have any questions regarding the necessary floodplain management measures for your community
or the NFIP in general, please contact the Mitigation Division Director, FEMA Region VIII, in Denver,
Colorado, either by telephone at (303) 235-4800, or in writing at Denver Federal Center, Building 710,
Box 25267, Denver, Colorado, 80225.
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If you have any questions regarding the LOMR, the proposed flood hazard determinations, or mapping
issues in general, please call the FEMA Map Information eXchange, toll free, at (877) 336-2627 (877-
FEMA MAP).
Sincerely,
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
cc: Mr. Tom Parko
Director of Planning
Weld County
Ms. Diana Aungst, CFM
Planner
Weld County
Mr. Steven Griffin, P.E., CFM
Project Engineer
Colorado Department of Transportation
Federal Emergency Management Agency
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
The Honorable Barbara Kirkmeyer
Chair, Weld County
Board of Commissioners
P. O. Box 758
Greeley, CO 80632
Washington, D.C. 20472
May 28, 2019
IN REPLY REFER
Case No.:
Community Name:
Community No.:
Effective Date of
This Revision:
TO:
19-08-0635P
Weld County, CO
080266
October 15, 2019
Dear Ms. Kirkmeyer:
The Flood Insurance Study (FIS) report and Flood Insurance Rate Map (FIRM) for your community have been
revised by this Letter of Map Revision (LOMR). Please use the enclosed annotated map panel revised by this
LOMR for floodplain management purposes and for all flood insurance policies and renewals issued in your
community.
Additional documents are enclosed that provide information regarding this LOMR. Please see the List of
Enclosures below to determine that documents are included. Other enclosures specific to this request may be
included as referenced in the Determination Document. If you have any questions regarding floodplain management
regulations for your community or the National Flood Insurance Program (NFIP) in general, please contact the
Consultation Coordination Officer for your community. If you have any technical questions regarding this LOMR,
please contact the Director, Mitigation Division of the Department of Homeland Security's Federal Emergency
Management Agency (FEMA) in Denver, Colorado, at (303) 235 4830, or the FEMA Map Information eXchange
(FMIX) toll free at 1 877 336 2627 (1 877 FEMA MAP). Additional information about the NFIP is available on our
website at https://www.fema.gov/ national -flood -insurance -program.
Sincerely,
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
List of Enclosures:
Letter of Map Revision Determination Document
Annotated Flood Insurance Rate Map
Annotated Flood Insurance Study Report
cc: Mr. Tom Parko
Director of Planning
Weld County
Ms. Diana Aungst, CFM
Planner
Weld County
Mr. Steven Griffin, P.E., CFM
Project Engineer
Colorado Department of Transportation
Gonna ri i 0-+; on S
c.o./lci
RECEIVED
JUN 0720
WELD COUNTY
COMMISSIONERS
GG'•OEM (RRTP),
PLAjCJM I 6R CO '/(DD)
C.O/(1/1c)
2019-2217
Page �1 of 4
'Issue Date: May 28, 2019
Effective Date: October 15, 2019
Case No.: 19-08-0635P
LOMR-APP
.
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O yAR TA,
° Federal Emergency Management Agency
�„ 4, Washington, D.C. 20472
L'9ND SE
LETTER OF MAP REVISION
DETERMINATION DOCUMENT
COMMUNITY AND REVISION INFORMATION
PROJECT DESCRIPTION
BASIS OF REQUEST
COMMUNITY
Weld County
Colorado
(Unincorporated Areas)
BRIDGE
FLOODWAY
HYDRAULIC ANALYSIS
HYDROLOGIC ANALYSIS
UPDATED TOPOGRAPHIC DATA
COMMUNITY NO.: 080266
IDENTIFIER
Coal Bank Creek Bridge Replacement SH 14
APPROXIMATE LATITUDE AND LONGITUDE: 40.582, -104.804
SOURCE: USGS QUADRANGLE DATUM: NAD 83
ANNOTATED MAPPING ENCLOSURES
ANNOTATED STUDY ENCLOSURES
TYPE: FIRM* NO.: 08123C1225E DATE: January 20, 2016
DATE OF EFFECTIVE FLOOD INSURANCE STUDY: January 20, 2016
PROFILE: 52P(a)
FLOODWAY DATA TABLE: 5
SUMMARY OF DISCHARGES TABLE: 2
Enclosures reflect changes to flooding sources affected by this revision.
* FIRM - Flood Insurance Rate Map
FLOODING SOURCE AND REVISED REACH
Coalbank Creek - from approximately 4,250 feet downstream of State Highway 14 to approximately 2,800 feet upstream of State Highway 14.
SUMMARY OF REVISIONS
Flooding Source Effective Flooding Revised Flooding Increases Decreases
Coalbank Creek No BFEs* BFEs YES NONE
No Floodway Floodway YES NONE
Zone A Zone AE NONE YES
Zone A Zone X (shaded) NONE YES
Zone A Zone X (shaded) NONE YES
* BFEs - Base Flood Elevations
DETERMINATION
This document provides the determination from the Department of Homeland Security's Federal Emergency Management Agency (FEMA)
regarding a request for a Letter of Map Revision (LOMR) for the area described above. Using the information submitted, we have determined that
a revision to the flood hazards depicted in the Flood Insurance Study (FIS) report and/or National Flood Insurance Program (NFIP) map is
warranted. This document revises the effective NFIP map, as indicated in the attached documentation. Please use the enclosed annotated map
panels revised by this LOMR for floodplain management purposes and for all flood insurance policies and renewals in your community.
This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have
any questions about this document, please contact the FEMA Map Information eXchange toll free at 1 877 336 2627 (1 877 FEMA MAP) or by letter addressed to the
LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304 6426. Additional Information about the NFIP is available on our website at
https.//www.fema.povinational-flood-insurance-program.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration 19-08-0635P 102 -I -A -C
Page 2 of 4
issue Date: May 28, 2019
Effective Date: October 15, 2019
Case No.: 19-08-0635P
LOMR-APP
z Federal
4
Emergency Management Agency
Washington, D.C. 2O472
AS�
ND
LETTER OF MAP REVISION
DETERMINATION DOCUMENT (CONTINUED)
COMMUNITY INFORMATION
APPLICABLE NFIP REGULATIONS/COMMUNITY OBLIGATION
We have made this determination pursuant to Section 206 of the Flood Disaster Protection Act of 1973 (P.L. 93-234) and in accordance
with the National Flood Insurance Act of 1968, as amended (Title XIII of the Housing and Urban Development Act of 1968, P.L. 90-448),
42 U.S.C. 4001-4128, and 44 CFR Part 65. Pursuant to Section 1361 of the National Flood Insurance Act of 1968, as amended,
communities participating in the NFIP are required to adopt and enforce floodplain management regulations that meet or exceed NFIP
criteria. These criteria, including adoption of the FIS report and FIRM, and the modifications made by this LOMR, are the minimum
requirements for continued NFIP participation and do not supersede more stringent State/Commonwealth or local requirements to which
the regulations apply.
We provide the floodway designation to your community as a tool to regulate floodplain development. Therefore, the floodway revision
we have described in this letter, while acceptable to us, must also be acceptable to your community and adopted by appropriate
community action, as specified in Paragraph 60.3(d) of the NFIP regulations.
NFIP regulations Subparagraph 60.3(b)(7) requires communities to ensure that the flood -carrying capacity within the altered or relocated
portion of any watercourse is maintained. This provision is incorporated into your community's existing floodplain management
ordinances; therefore, responsibility for maintenance of the altered or relocated watercourse, including any related appurtenances such as
bridges, culverts, and other drainage structures, rests with your community. We may request that your community submit a description
and schedule of maintenance activities necessary to ensure this requirement.
COMMUNITY REMINDERS
We based this determination on the 1 -percent -annual -chance discharges computed in the submitted hydrologic model. Future
development of projects upstream could cause increased discharges, which could cause increased flood hazards. A comprehensive
restudy of your community's flood hazards would consider the cumulative effects of development on discharges and could, therefore,
indicate that greater flood hazards exist in this area.
Your community must regulate all proposed floodplain development and ensure that permits required by Federal and/or
State/Commonwealth law have been obtained. State/Commonwealth or community officials, based on knowledge of local conditions
and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If your
State/Commonwealth or community has adopted more restrictive or comprehensive floodplain management criteria, those criteria take
precedence over the minimum NFIP requirements.
We will not print and distribute this LOMR to primary users, such as local insurance agents or mortgage lenders; instead, the community
will serve as a repository for the new data. We encourage you to disseminate the information in this LOMR by preparing a news release
for publication in your community's newspaper that describes the revision and explains how your community will provide the data and
help interpret the NFIP maps. In that way, interested persons, such as property owners, insurance agents, and mortgage lenders, can
benefit from the information.
This determination is based on the flood data presently available.
any questions about this document, please contact the FEMA Map
LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria,
https://www.fe magoy/national-flood-insurance-program.
The enclosed documents provide additional information regarding this determination. If you have
Information eXchange toll free at 1 877 336 2627 (1 877 FEMA MAP) or by letter addressed to the
VA 22304 6426. Additional Information about the NFIP is available on our website at
"Rick" F. Sacbibit, P.E., Branch Chief
Services Branch
Insurance and Mitigation Administration 19-08-0635P 102 -I -A -C A -C
Patrick
Engineering
Federal
Page 3 of 4
Issue Date: May 28, 2019
Effective Date: October 15, 2019
Case No.: 19-08-0635P
LOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
LETTER OF MAP REVISION
DETERMINATION DOCUMENT (CONTINUED)
We have designated a Consultation Coordination Officer (CCO) to assist your community. The CCO will be the primary liaison between
your community and FEMA. For information regarding your CCO, please contact:
Ms. Jeanine D. Petterson
Director, Mitigation Division
Federal Emergency Management Agency, Region VIII
Denver Federal Center, Building 710
P.O. Box 25267
Denver, CO 80225-0267
(303) 235-4830
STATUS OF THE COMMUNITY NFIP MAPS
We will not physically revise and republish the FIRM and FIS report for your community to reflect the modifications made by this
LOMR at this time. When changes to the previously cited FIRM panel and FIS report warrant physical revision and republication in the
future, we will incorporate the modifications made by this LOMR at that time.
This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have
any questions about this document, please contact the FEMA Map Information eXchange toll free at 1 877 336 2627 (1 877 FEMA MAP) or by letter addressed to the
LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304 6426. Additional Information about the NFIP is available on our website at
https://www.fema.gov/national-flood-insurance-program. -
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
19-08-0635P 102 -I -A -C
Page 4 of 4
Issue Date: May 28, 2019
Effective Date: October 15, 2019
Case No.: 19-08-0635P
LOMR-APP
Federal Emergency Management Agency
Washington, D.C. 20472
LETTER OF MAP REVISION
DETERMINATION DOCUMENT (CONTINUED)
PUBLIC NOTIFICATION OF REVISION
A notice of changes will be published in the Federal Register. This information also will be published in your local newspaper on or
about the dates listed below, and through FEMA's Flood Hazard Mapping website at
https://www.floodmaps.fema.govithrnibfe_statusibfejnain.asp
LOCAL NEWSPAPER
Name: The Greeley Tribune
Dates: June 7, 2019 and June 14, 2019
Within 90 days of the second publication in the local newspaper, any interested party may request that we reconsider this determination.
Any request for reconsideration must be based on scientific or technical data. Therefore, this letter will be effective only after the 90 -day
appeal period has elapsed and we have resolved any appeals that we receive during this appeal period. Until this LOMR is effective, the
revised flood hazard determination presented in this LOMR may be changed.
This determination is based on the flood data presently available. The enclosed documents provide additional information regarding this determination. If you have
any questions about this document, please contact the FEMA Map Information eXchange toll free at 1 877 336 2627 (1 877 FEMA MAP) or by letter addressed to the
LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304 6426. Additional Information about the NFIP is available on our website at
https://www.ferna.qovinational-flood-insuranbe-program.
Patrick "Rick" F. Sacbibit, P.E., Branch Chief
Engineering Services Branch
Federal Insurance and Mitigation Administration
19-08-0635P 102 -I -A -C
Table 2 — Summary of Discharges
Flooding Source and Location
Ashcroft Draw
At Mouth
Downstream of Arrowhead Reservoir
Upstream of Arrowhead Reservoir
At Upstream Limit of Study
Big Thompson River
Larlmer-Weld County Line
Upstream from Little Thompson River
Downstream from Little Thompson River
Confluence with South Platte River
Boulder Creek
Weld -Boulder County Line
Boulder Creek Turnpike
Cache La Poudre River
At Mouth
At Eaton Draw
Downstream of Coalbank Creek
Upstream of Coalbank Creek
Downstream of Law Ditch
Upstream of Law Ditch
Downstream of Boxelder Creek
Coal Creek
At Briggs Street
Near Tri-County Airport
Coalbank Creek
At Confluence with Cache La Poudre River 46
Approximately 3,300 feet downstream of
State Highway 14 31.34 106 241 305 • 520
Upstream of State Hi hway 14 31 07 106 233 295 505
Revised
Data --►
Peak Discharges (cfs)
Drainage Area 10 -Percent 2 -Percent 1 -Percent 0.2 -Percent
(Square Miles) Annual Chance Annual Chance Annual Chance Annual Chance
6.33
4.37
4.37
1.86
285
244
458
256
696 3,600
613 2,200
813 3,200
819 2,500
710
510
1,130
640
7,600
4,700
7,300
5,900
1,890 3,100 7,550
1,875 3,400 7,660
1,810 3,900 8,540
1,747 3,870 8,470
1,707 4,620 9,720
1,662 4,590 9,640
1,537 6,750 13,200
77.48
68.61
6,160
5,970
10,040
9,670
960
654
1,546
860
1,840
1,100
3,000
1,650
10,000 18,500
6,500 12,000
9,900 20,000
8,000 15,000
13,750
11,445
10,600 22,800
10,700 22,700
11,800 24,400
11,700 24,200
13,200 26,300
13,100 26,100
17,400 32,400
12,280
11,850
18,380
17,860
'Data Not Available
772 1,531
1,817 2,724
REVISED TO
REFLECT LOMR
EFFECTIVE: October 15, 2019
FLOODING SOURCE
FLOODWAY
1 -PERCENT -ANNUAL CHANCE FLOOD
WATER SURFACE ELEVATION
SECTION
MEAN
CROSS SECTION
DISTANCE'
WIDTH WIDTH
(FEET)
AREA
(SQUARE
FEET)
VELOCITY
(FEET PER
SECOND)
REGULATORY
(FEET NAVD )
WITHOUT
FLOODWAY
(FEET NAVD)
WITH
FLOODWAY
(FEET NAVD)
INCREASE
(FEET)
COALBANK CREEK
BA
BB
-3,435
105
321
1.0
4,969.6
4,969.6
4,969.6
0.0
BC
-1,922
33
44
6.6
4,970.8
4,970.8
4,970.9
0.1
BD
-1,348
85
154
1.9
4,976.6
4,976.6
4,976.7
0.1
BE
-892
34
45
6.5
4,982.3
4,982.3
4,982.4
0.1
BF
-415
99
232
1.3
4,986.0
4,986.0
4,986.0
0.0
BG
113
47
72
4.1
4,994.3
4,994.3
4,994.5
0.2
BH
804
78
77
3,9
4,996.3
4,996.3
4,996.3
0.0
BI
1,771
129
70
4.2
5,003.6
5,003.6
5,003.6
0.0
2,199
111
66
4.4
5,007.8
5,007.8
5,007.8
0.0
1
Stranm djetonnc i., f.,..-4
above State Highway 14
FEDERAL EMERGENCY MANAGEMENT AGENCY
WELD COUNTY, CO
AND INCORPORATED AREAS
REVISED TO
FLOODWAY DATA
REFLECT LOMR
EFFECTIVE: October 15, 2019
COALBANK CREEK
REVISED TO
FLOOD PROFILES REFLECTLOMR
EFFECTIVE: October 15, 2019
COALBANK CREEK
O
D
.4.
5,010
OF DETAILED`E
DRIVEWAY
DRIVEWAY
ATE HIGHWAY
LIMIT OF
ETAILED STUD'
5,000
v-
0
5,010
co
z 4,990
5,000
I--
/
4,990
w
z
0 4,980
LU
w
THE 10%, 2%, AND
ARE TOO CLOSE
FLOOD ELEVATIONS
0.2')/0 ANNUAL
TO THE 1%
TO BE SHOWN
CHANCE FLOOD
ANNUAL CHANCE
SEPERATELY
PROFILES
4,980
FEDERAL EMERGENCY MANAGEMENT AGENCY
WELD COUNTY, CO
AND INCORPORATED AREAS
4,970
/ JJ
4,970
4,960
BH
C.)
4,960
LEGEND
0.2% ANNUAL
CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
4,950
2% ANNUAL CHANCE FLOOD
- - 10% ANNUAL CHANCE FLOOD
BA
BB
BC
BD
BE
BF
g
\\\(//t\�V" STREAM BED
0 CROSS SECTION LOCATION
4,940
-3,500 -3,000 -2,500 -2,000 -1,500 -1,000 -500 0 500 1,000 1,500 2,000 2,500
STREAM DISTANCE IN FEET ABOVE STATE HIGHWAY 14
52P(a)
ZONE AE
�I
NOTE
:ON
[RANGE
Driveway
4976.6
4972.9
C~oaks an
alter
SPECIAL FLOOD
HAZARD AREAS
OTHER AREAS OF
FLOOD HAZARD
Wir
Without Base Flood Elevation (BFE)
Zone A. V, A99
With BFE or Depth Zone AE. AO. AH. YE. AR
Regulatory Floodway
0.2 % Annual Chance Flood Hazard, Areas
of 1% annual chance flood with average
depth less than one foot or with drainage
areas of less than one square mile
Future Conditions 1% Annual
Chance Flood Hazard
Area with Reduced Flood Risk due to Levee
See Notes. ;,;r,
SCALE
N
Map Projection:
Universal Transverse MercatorNAD 1983 UTM Zone 13N
Western Hemisphere: Vertical Datum: NAVD 88
1 inch = 2,000 feet
0
0
250 500
2,000
124.000
4 000
Feet
Meters
1,000
E
ti
wo
O
2
CL
a)
C
G/)
a
National Flood
NATIONAL FLOOD INSURANCE PROGRAM
FLOOD INSURANCE RATE_ MAP
WELD COUNTY, COLORADO
and Incorporated Areas
PANEL 1225 of 2250
Panel Contains:
COMMUNITY
WELD COUNTY
NUMBER PANEL SUFFIX
080266
REVISED TO
REFLECT LOMR
EFFECTIVE: October 15, 2019
VERSION NUMBER
1.1.1.0
MAP NUMBER
08123C1225E
MAP REVISED
JANUARY 20. 2016
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