WSP02745

• File Number: 8220.100.40
• Description: CRSP
• Basin: Colorado Mainstem
• Date: 6/30/1984
• Author: USDOI
• Title: 28th Annual Report on the Statuts of the Colorado River Storage Project
• Water Supply Pro - Doc Type: Annual Report

Big S<'lrldv Spillway rehabllil,llion

with the municipal and industnal repayment
a1 the outset.

And tourth, no legislation would be required
at Congress to implement this proposal.
We have the authority we need within our
own regulations,

A concrete cutoff wallis being proposed
for repair of Fontenelle Dam, The diaphragm
wall would be inserted in the seepage-
prone areas of the dam, Installafion of a
test section, possibly in 1985, is dependent
on the availability of funding, Construction
of the test section will require holding
Fontenelle Reservoir at a low elevation
during 1985 and allowing it to rise to its
currently controlled elevation prior to a
second drawdown at the start of construc-
tion of the tull cutoff wall. Releases will be
managed so that tile combined powerplant
and river outlet works can be operated
without exceeding the Green River flood
channel capacity,

... ~4oOt,
Excavation of the roller compacted concrete tesl section

At Big Sandy Dam, major repair was nec-
essary on the spillway where frost action
and the runoff waters loosened the slabs
of concrete in the dam's spillway, The
contract tor repair was awarded in April
1984 and is expected to be completed in
1985,

Upper Stillwater Dam foundation explora-
tion was completed in November 1984,
The contract for aggregate production for
the dam was cancelled, A new contract
will be procured in 1985 to acquire the
needed aggregate for Reclamation's first
"Roller Compacted Concrete" dam which
is scheduled for completion in July 1987,
Cost of the dam is estimated to be
$60,603,625,

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Concrete placement at Strawberry Tunnel Inlet

A study of seepage water flowing through
the rock abutments of Navajo Dam indi-
cates that additional seepage control
measures are desirable, although it poses
no danger to the safety at the dam, Mea-
sures now being considered include exca-
vation of drainage tunnels, insertion of
drain pipes and grouting wi1h cement grout
and a concrete diaphram wall.

Seepage around the dam was first noted
in the early 1960's when Navajo Lake
filled for the first time, Although amounts
of seepage water vary with the level of the
lake, the average flow has changed only
slightly over the last 10 years or more,

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