WSP09608

• File Number: 8220.112.A
• Description: Dallas Creek Participating Project
• State: CO
• Basin: Gunnison
• Water Division: 4
• Date: 3/1/1965
• Author: Tri-County WCD
• Title: Application to National Rivers and Harbors Congress/Projects Committee - for Examination and Classification of Project
• Water Supply Pro - Doc Type: Project Overview

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CHAPrEll. III

PRELIMINARY
DESIGNS AND ESTIMATES

Dallas divide Dam would be a rolled earthfill structure with a vol.

ume of 1,185,000 cubic yards. It would be about 165 feet high above

streambed. The crest of the dam would be 4,420 leet long and 30 feet
wide. The spillway for the reservoir would be located on the left 'abut-
ment of the dam and would be an uncontrolled oerflow structure with a

design capacity of 280 second-feet at maxiDIUDI water surface elevation

8789.5 feet. The outlet works, alao in the left abutment of the dam,
liOuld be designed to released 110 second-feet to Log lij.ll Mesa Canal and,

40 second-feet to Pleasant Valley Creek with the water surface at ele-
vation 8,769 feet.

Impervious eDlbankment materials and two poul. ble aources of riprap

are located withl.n 1 mill! of the clam dte. ' Pervious materials would
have to be ~ul.d 'from the San Miguel B,iver, a d1atance of approximately
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12 miles.

Sneva R.eservoir '

The Sneva R.eservoir development would condst of construction of

the reservoir at a site offstream from Cow Creek and relocation of the

existing Snevaditch'that extends from (;ow Creek and passes through the

reservoir basin.

Sneva R.eservoir would have a total capacity of 825 acre-feet, oi

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which 800 acre-feet would be active and 25 acra-feet dead and inactive.

A.surcharga capacity of 80 acre-feet would be provided above the normal

water surface 7 ,6~5 feet. Sediment depodtion 18 expeeted to be neUg-

ible. The reservoir would inundate an area of about 40 acres at normal

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water sur!aee elevation 7,655 feet.