FLOOD03286

• County: Adams
• Community: Wheat Ridge, Arvada
• Stream Name: Lower Clear Creek
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 10/1/1981
• Prepared For: Adams County
• Prepared By: UDFCD
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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nelized section with reclaimed adjacent floodplain has been proposed
downstream to the Colorado & Southern bridge by Brannan Sand and Gravel.
PI ans for these improvements have not yet been final ized by Brannan nor
accepted by Adans County or the Urban Drainage and Flood Control District.
Channel and bridge improvements at Pecos Street have been designed to meet
the Urban Drainage & Flood Control District's six-inch overtopping criteria.
The remainder of the reach to Huron Street is designated for Floodplain
Preservation.

1-2

. Contents and improvements of the recommended plan shown on each draw-
i ng, and

. Detailed description of each drawing.

REACH I (Station 0+00 to Station 153+00)

The Phase B
calculations.
bound volume.

report also contains major graphical studies, plans, and
This Phase B report is contained in a single plastic comb-

Study Reach I, from Huron Street, downstream to the confl uence of the South
Platte River is designated for Floodplain Preservation with Limited
Improvements, including the removal of a constriction between Station 2+00
and 4+00 and the construction of 400-feet of channel extension from the
existing Brannan Sand and Gravel channel to the South PI atte River. This
segment is located between Colorado State Highway 224 and Interstate-76.

THE STUDY AREA

PURPOSE AND SCOPE

The lower Clear Creek study area includes that reach of Clear Creek from its
confluence with the South Platte River, west to the Wheat Ridge corporate
limits, at Youngfi e 1 d Street. With in the study area, Cl ear Creek passes
through unincorporated areas of Adams and Jefferson Counties, and the Cities
of Arvada and Wheat Ridge.

The Phase B study, Prel iminary Design, was developed and refined based upon
our Phase B Scope of Services stated in our contract with the Urban Drainage
and Flood Control District, with recommendations resulting from the Phase A
Study (Reference 42), and adoption of the selected alternatives by the
Cities of Wheat Ridge and Arvada, Adans County, and the Urban Drainage and
Flood Control District. Prel iminary designs have been prepared in
sufficient detail to pI an bridge and culvert improvements, channel
mod ifications, and to ident Hy flood hazard areas for fl oodpl ain management
and preservation. The Prel iminary Design plan specifically includes:

The Clear Creek drainage basin, above Golden, Colorado, contains some 400
square miles, with the total basin area above the confluence of the South
Platte River containing a total area of 575 square miles. The drainage
basin boundary is shown in Figure I-I.

. Detailed cost estimates for the proposed improvements.

For purposes of this study, lower Clear Creek has been divided into five
study areas, shown in Figure 11-1 and described in detail in Section II of
this report. The study area contains approximately the lower 12 miles of
the Clear Creek mainstream.

. Prel iminary design of drainage facil ities on 22" x 34" pI an and pro-
file my 1 ars.