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

COMMENTARY

Station 540+00 to Station 600+00
950-feet downstream of Kipling Street to Prospect Park
Portions of Reaches III A & III B
The floodplain management strategy for this segment includes a combination
of Floodplain Preservation and Channel Improvp.men~ at Kipl ing Street and at
the confluence of Lena Gulch.

COST ESTrr~ATE

Station 540+00 to Station 600+00

CONSTRIJCTI ON

The proposed improvements at Kipl ing Street include 1800-feet of rock-lined
channel, a new 50-feet bridge span extension and a low water crossing at
Lena Gulch. A 3~-inch sanitary sewer will be relocated along the north bank
outside the channel limits. The existing trail downstream of Kipling will
be relocated to the south bank. This is necessary because of the lack of
available land. on the north side of the creek after channel improvements are
made.

Channe 1 Improvement Co st s

Channel-Crossing Costs

The proposed channel improvements at Kipl ing coupled with the completed Lena
Gulch project should el iminate the overtopping of Kipl ing Street by the
100-year flood. At Station 556+00 the floodplain 1 imits encroach on an
office building parking lot currently planned for construction. The
100-year floodpl ain will be confined to the proposed channel from Station
555+00 to Station 546+00. From Station 546+00 downstream to Station 540+00,
where the improved floodplain joins the regulatory floodplain, the channel
is breached creat ing shallow flood ing immed i ate 1 y adj acent to the channp.l
pro per.

IJtility Relocation Costs

TOTAL CONSTRUCTION COSTS

ENGINEERING AND CONTINGENCIES (30% of Construction Costs)

It should be noted that the regulatory floodplain needs to be maintained
until the complete Lena Gulch improvement project and the proposed Clear
Creek improvements have been constructed and a new floodpl ain is adopted.

FISCAL, LEGAL AND ADMINISTRATIVE (10% of Above Total)

Two residential structures, on Pierson Street, will remain within the regu-
latory floodplain. Flood insurance should be purchased by these residences,
and, if substantially d1ll1aged or totally destroyed by flood d1ll1ages, the
strucutres should be acquired under the constructive total loss provisions,
or Section 1362, of the Flood Insurance Act. The acquired parcels could
then be ded icated to the City of Wheat Ridge for park and open space
purposes.

PROPERTY ACQIJISITION COSTS

The hiker/biker trail continues on the south side of the creek to West 41st
Avenue. It is recommended that the City of Wheat Ridge proceed with the
proposed pl an to purchase a 20-feet easement along the north edge of the
Northwest Lake\ll)od Treatment Pl ant. The proposed maintenance access road
will connect the trail system to the Lena Gulch system, currently under con-
struction, with a low water crossing at the confluence.

MAINTENANCE

TOTAL IMPROVEMENT COSTS
(1981 Doll ars)

Annual ()peration/Ma intenance Cost

Maintenance access will be provided at West 41st Avenue, at the treatment
plant and at Lena Gulch, thereby avoiding Kipl ing Street traffic.

$1,431,100

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$ 340,900

$ 120,000

$1,892,000

$ 5fi7,600

$ 246,000

$ 152,400

$2,858,000

$ 22,100