Lower South Platte River Study

• Contractor Name: Colorado Water Conservation Board
• Loan Projects - Doc Type: Feasibility Study

Lower South Platte River Study
Colorado Water Conservation Board
' December 2001
2,100 feet. The total cost for the construction of the dam would be $4,750,000,
' which is $1,900 per acre-foot of storage.
Skinner Draw
' The Skinner Draw Reservoir site is located about 42 miles upstream of the state line
' along the Lower South Platte River, 9 miles west of Crook, Colorado and 4 miles
north of Proctor, Colorado. The lands that would be inundated are privately owned.
The valley at the dam site has steep abutments, an incised drainage, and occasional
outcrops of slightly cemented siltstone. Shallow depth to bedrock is expected at the
dam site. A road would need to be relocated for the construction of the reservoir and
buildings and a windmill are located near the site. A potentially perennial stream
' runs directly through Skinner Draw at the proposed site, and wetland areas are
identified on USFWS mapping. The reservoir would have a capacity of 5,400 acre-
feet, with a maximum normal pool level at Elevation 3940. The dam would be a
' zoned embankment with a height of 60 feet and crest length of 1,900 feet. The
contributing drainage area to the site is 7.1 square miles, and the reservoir could be
' filled by gravity from the North Sterling Outlet Canal or by pumping from the
Harmony Ditch. The dam is estimated to cost $5,530,000, which is $1,020 per acre-
foot of storage.
' New Ring-Dike Sites
' Troelstrup
' The site for developing Troelstrup Reservoir is located about 3.5 miles upstream of
the Colorado-Nebraska State line along the Lower South Platte River, one-quarter
mile southwest of Julesburg, Colorado. Land that would be inundated by the
' reservoir is privately owned and it is not likely that any roads will need to be
relocated for the construction of the reservoir, although a building would be
impacted by reservoir construction. No streams run through the site. The
contributing drainage area above the ring-dike is 23 square miles; however, the dam
would be entirely above grade so that the only uncontrolled water reaching the
' reservoir would be from precipitation. There are wetlands identified by USFWS at
the site. The reservoir could be filled using the Peterson Canal or by pumping
directly from the Lower South Platte River. The reservoir would have a capacity of
' 5,000 acre-feet and a maximum normal pool at Elevation 3484. The dam would be
zoned embankment with a height of 30 feet and a crest length of 17,650 feet due to
the ring-dike configuration. The total cost for the construction of the reservoir
' would be$8,640,000, which is $1,730 per acre-foot of storage.
GEI Consultants, Inc. 4-17 01002 Dec 2001 Lower South Platte River Study