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COLORADO
Department of Transportation
Region 4
Central Program RE's Office
10601 10t Street
Greeley, CO 80634
February 17, 2023
Weld County Administration
c/o Commissioner Mike Freeman
1150 O Street
Greeley, CO 80631
Parcel Numbers: 96114000003
RECEIVED
FEB 2 4 2023
WELD COMMISSIONERS
Re: Notification of changes to the 1% (100-yr) annual chance floodplain on South
Platte River
Dear Sir,
This letter is to inform you of flood hazard revisions on your property at parcel
numbers 96114000003 in Weld County Colorado.
The Flood Insurance Rate Map (FIRM) for a community depicts the floodplain, the
area which has been determined to be subject to a 1% (100 -year) or greater chance of
flooding in any given year. The floodway is the portion of the floodplain that includes
the channel of a river or other watercourse and the adjacent land area that must be
reserved in order to discharge the base flood without cumulatively increasing the
water -surface elevation by more than a designated height. The FIRM is used to
determine flood insurance rates and to help the community with floodplain
management.
The Colorado Department of Transportation (CDOT) is applying for a Letter of Map
Revision (LOMR) from the Federal Emergency Management Agency (DHS-FEMA)
to revise FIRM(s) 08123C1542E, 08123C1543E, 08123C1544E, and 08123C1563E,
for Weld County, Colorado along the South Platte River. CDOT is proposing to
revise the FIRM to reflect the repairs to the existing bridge on US Highway 34D (US -
34D) over the South Platte River. In addition to the bridge repairs, CDOT completed
roadway improvements and grading along US -34 and US -34D within the South Platte
River regulatory floodplain (Zone AE). Following the completion of the bridge
repairs, CDOT performed a hydraulic study on the South Platte River that establishes
new Base (1% annual chance) Flood Elevations (BFEs) in the area near to the bridge
repair project area.
10601 10t" Street Greeley, CO 80634-9000 P 970.350.2228 www.codot.gov
Jared S. Polis, CO Governor I Shoshana M. Lew, CDOT Executive Director
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2023-0672
The Weld County Department of Planning Services, in accordance with National
Flood Insurance Program regulation 65.7(b)(1), herby gives notice of the County's
intent to revise the 1% annual chance (100 -year) floodway. Specifically, the
floodway shall be:
1.Revised from a point approximately 3,018 feet upstream of the US -34
bridge crossing of the South Platte River to a point approximately 4,861
feet downstream of the US -34D bridge crossing of the South Platte
River.
As a result of the LOMR, the floodway will widen and narrow within the area of
revision. The LOMR will also result in:
1.Increases and decreases in the BFEs.
2.The 1% annual chance floodplain will widen and narrow.
Each of these activities results in a change to the previously established Zone AE
(approximate) floodplain boundaries. Each activity has been designed to minimize all
potential increases in localized flood depths, and to reduce the area of private and
public property affected by flooding. Quantifiable changes to the floodplain limits
and 1% annual chance water surface elevations are identified and disclosed to you on
your property as part of this notification effort, visible on the attached ownership
map.
Maps and detailed analysis of the flood hazard revision can be reviewed on the
National Flood Hazard Layer at https://hazards-fema.maps.arcgis.com. If you have
any questions or concerns about the proposed changes to the FIRM, or its effect on
your property, you may contact Lou Keen at the Colorado Department of
Transportation, at 970-350-2228 or louis.keen@state.co.us, who was the engineer of
record responsible for preparing the floodplain revision.
Sincerely,
7- h
Louis E. Keen, PE
Resident Engineer
R4 Central Program Engineering
Attachment: Ownership Map
10601 10" Street Greeley, CO 80634-9000 P 970.350.2228 www.codot.gov
Jared S. Pots, CO Governor I Shoshana M. Lew, CDOT Executive Director
1 inch = 1,250 feet
US 34D LOMR
Ownership Map
NOTES:
• Base Flood Elevations reference NAVD88
• Vertical Datum = NAVD88
• Horizontal Datum = NAD83
• Colorado State Plane North (FEET)
• Date of Imagery: August 2020
As -Built 1% (100-year)Annual Chance
Floodplain
As -Built 0.2 % (500 -year) Annual Chance
Floodplain
LEGEND
Base Flood Elevations (BFE)
air, As -Built 0.5 Foot Floodway
Effective FEMA Zone AE Boundary
0
County & Municipal
Limits
South Platte River
Channel
Parcels
RSsH
FEBUARY 2023
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