FLOOD08730

• County: Jefferson
• Community: Jefferson County
• Stream Name: Bear Creek
• Basin: South Platte
• Title: Letter of Map Revision Bear Creek Tributary Number 5
• Date: 8/1/1992
• Prepared For: State of Colorado
• Prepared By: Martin/Martin
• Floodplain - Doc Type: Floodplain Report/Masterplan

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MARTIN/MARTIN

Consulting Engineers

~251 "'Ipllng
Wneat Riege COlcrado 80033
30343:6100

September 8, 1992

Jeannie Rossillon
Jefferson County Highways and Transportation Dept.
700 Jefferson County Parkway, Suite
Golden, Colorado 80401

Re: Bear Creek Filing NO.2 FEMA Letter of Map Revision

Dear Jeannie,

We have completed our study of Bear Creek Tributary No. 5 and have prepared
technical supporting data for requesting a Letter of Map Revision (LOMR) from the
Fedaral Emergency Management Agency (FEMA). The area of study was Bear
Crellk Tributary No. 5 within Block 3 of Bear Creek Subdivision Filing No.2,
Jeffllrson County, Colorado. A Map Revision is required to revise the FEMA 100,
year floodplain due to an existing storm sewer system which has been placed at
various times by different parties within Bear Creek Tributary No. 5 from below
South Zinnia Street to upstream of West Yale Avenue. A Plat restriction on the
sale, conveyance or transfer of title of lots lying within the existing 100'year FEMA
floojplain, was placed on the plat for Bear Creek Filing No.2 with the stipulation
that a Letter of Map Revision from the Federal Emergency Management Agency be
submitted to Jefferson County prior to the County issuing building permits or
certificate of compliance for such lots.

A portion of the storm sewer facilities are located within the City of Lakewood. The
corporate limits between Jefferson County and the City of Lakewood coincides with
the westerly property line of Block 3 which is the upstream limits of this study. The
storm sewer discharges to the natural drainageway below South Zinnia Street
which is the downstream limits of this study.

PREVIOUS STUDIES

Bear Creek Tributary No. 5 has been previously analyzed by FEMA in a flood
insurance study (FIS) entitled "Flood Insurance Study, Jefferson County, Colorado,
Unincorporated Areas" dated August 5, 1986, Community Number 080087.
Pertinent portions of the existing Flood Insurance Study have been included in
AppendiX A of this study. The drainageway was also included in a study for the
Urban Drainage and Flood Control District (UD&FCD) entitled "Flood Hazard Area
Delineation, Green Mountain Area", dated April 1978, prepared by Hydro,Triad, Ltd.

It should be noted that the tributary west of Bear Creek Filing No.2, Block 3, is
not shown as a designated floodplain in the City of Lakewood Insurance Study.