BOARD01591

• Board Meeting Date: 1/22/1987
• Description: CWCB Meeting
• Board Meetings - Doc Type: Meeting

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Draft
1/22-23/87

Colorado Water Conservation Board
1313 Sherman Street, Room 721
Denver, Colorado 80203

Peterson Reservoir Project
(City of Greeley)

IntrOduction

Peterson Reservoir is a high elevation raw water storage
unit owned by the City of Greeley. It is located on a small
unnamed tributary of the Cache la Poudre River approximately 6
miles northeast of Cameron Pass in Larimer County. Peterson Dam
is an earth fill dam with a maximum height of 57 feet and a
crest length of 175 feet. At normal maximum water surface
elevation, the reservoir impounds 1,252 acre-feet of water.

Problem

In August, 1982, the State Engineer restricted storage in
Peterson Reservoir to 536 acre-feet due to excessive seepage and
the high phreatic surface within the dam, In 1985, the city
imposed a zero storage restriction on the reservoir due to the
reduced discharge capacity of the outlet works caused by
modifications ordered by the city,

Since the decreed storage in this reservoir is vital to the
city'S winter water distribution operations, the city had a
feasibility study performed to determine how best to rehabilitate
the dam so that the reservoir could once again be filled to it's
decreed capacity. This study was performed by Morrison-Knudson
Engineers, Inc., of Denver, and is the basis for the
recommendation on this project.

Proposed Proiect

After studying several alternative methods of rehabilitating
Peterson Dam, the consultants selected the one that would
flatten the upstream slope of the dam, replace the operating
gate, replace the inlet and outlet structures, place a steel
liner insert in the existing outlet works, armor plate the
existing spillway with roller compacted concrete, armor plate
the upstream slope of the dam with soil cement, and make
provisions to reduce, control and collect the embankment
seepage. The estimated cost of this project is $760,000.

2351E

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