FLOOD00654

• County: Jefferson
• Community: Lakewood
• Stream Name: Lena Gulch
• Title: LOMR - Affected Panel 085075 0005 C - Case No. 94-08-086P
• Date: 5/23/1994
• Prepared For: Lakewood
• Prepared By: FEMA
• Floodplain - Doc Type: Historic FEMA Regulatory Floodplain Information

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CHANGES ARE MADE IN DETERMINATIONS OF BASE FLOOD ELEVATIONS FOR THE CITY OF

LAKEWooD, JEFFERSON COUNTY, COLORADO, UNDER THE NATIONAL FLOOD INSURANCE

PROGRAM

On January 3, 1983, the Federal Emergency Management Agency (FEMA)

identified Special Flood Hazard Areas (SFHAs) in the City of Lakewood,

Jefferson County, Colorado, through issuance of a Flood Insurance Rate Map
(FIRM).

The Mitigation Directorate has determined that modification of the

elevations of the flood having a l-percent chance of occurrence in any given

year (base flood) for certain locations in the City of Lakewood is

appropriate. The modified base (lOO-year) flood elevations (BFEs) revise the

FEMA FIRM for the community.

The changes are being made 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.

A hydraulic analysis was performed to incorporate removal of a single

culvert, installation of a five-cell box culvert, and construction of a

floodwall at the upstream side of West 20th Avenue along the east side of

Lena Gulch. This hydraulic analysis had resulted in a reduction in SFHA and

lower BFEs along Lena Gulch from West 20th Avenue upstream to approximately

1,700 feet upstream of West 20th Avenue. Additionally, a hydraulic analysis

was performed to incorporate updated topographic information, specifically,

the Rocky Mountain Ditch Flume, and has resulted in an increase in SFHA and

higher BFEs along Lena Gulch from the Maple Grove Reservoir upstream to