WSP09218

• File Number: 8200.765
• Description: Little Snake River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 7/31/1990
• Author: Western Water Consul
• Title: Final Report on Little Snake River Depletions by Pot Hook - Three Forks - and Powder Wash Rights
• Water Supply Pro - Doc Type: Report/Study

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c.n.ogs 1

2.2.2 Previous WIRSOS Model Runs
As part of the Sandstone Depletion Study, WWC modeled the Little Snake River

under four different scenarios acceptable to the USFWS, i.e. Present Modified Conditions

(PMC), Environmental Baseline (EB), Environmental Baseline with Sandstone Reservoir

providing supplemental irrigation and municipal water (EB/SS-M), and Environmental

Baseline with Sandstone Reservoir providing supplemental irrigation and municipal water,

and industrial water (EB/SS-I). The following discussion is a brief description of each of
the above scenarios.

2.2.2.1 Present Modified Conditions (PMC). The PMC run simulated operation of the

Little Snake River over the 1930-1982 period of record with the level of development and

use existing along the river as of 1982. Demands on river water included current valid

water rights for irrigation and municipal uses (Baggs and Dixon) and depletions due to

trans mountain diversion for the Cheyenne Stage I project.

2.2.2.2 Environmentnl Baseline (EB). The EB run simulated operation of the Little

Snake River over the 1930-1982 period using the demand level prepared for the PMC run

plus City of Cheyenne Stage II depletions and permitted water rights which are senior in

priority to Sandstone Reservoir.

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