PROJ00265

• Contract/PO #: FS0010X
• Contractor Name: Broomfield, City of
• Contract Type: Loan
• Water District: 0
• County: Jefferson
• Loan Projects - Doc Type: Feasibility Study

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Colorado Water Conservation Board
1313 Sherman Street
Denver, Colorado 80203

Gentl emen:

The City of Broomf i e 1 d is propos i og a proj ect for the enlargement of
Great Western Dam and Spillway. This project is a result of the City
of Broomfield1s need for additional capacity for water storage,
coupled with the need for enlargement of the emergency spillway capa-
city at Great Western Dam. The primary finding of the 1981 "Phase I
Dam Safety Inspection" of Great Western Dam was that the changing of
State standards for spillways has caused the spillway to be inadequate
to pass a probable maximum flood. The City of Broomfield then pro-
ceeded with studies of alternative solutions to this problem. The
studies indicated that the most economical solution to the spillway
problem was a combination of spillway construction and dam enlargement
to develop additional reservoir storage capacity and freeboard. The
proposed project will address both the spillway capacity and the need
for additional storage.

The CWeB has previously authorized construction loan funding for the
Great Western Dam and Spillway Enlargement Project which included
enlarging the reservoir to 9,000 acre-feet and constructing a new
spillway.

The City of Broomfield is now submitting the Amended Feasibility Study
and accompanying documents relative to the proposed "Great Western Dam
and Spillway Enl argement Projectll. These documents are being sub-
mitted for your consideration in conjunction with our amended applica-
tion for State construction loan funds. Recent water rights
acquisitions and studies now indicate a 12,000 acre-foot reservoir is
needed to maximize the yield of the City.s water rights. The amended
project cost is estimated to be $10,795,000. Features of the amended
project not included in the original project are: replace the outlet
conduit, influent conduit, and intake structure; additional land
purchase; pump station improvements; and quantity estimates based on a
preliminary (rather than Feasibility Level) design. The requested
State construction loan funding is now $5,397,500 of which $2,155,850
has previously been authorized.