WSP05094

• File Number: 8277.600.10
• Description: Big Sandy River Unit - Colorado River Salinity Control Program
• State: WY
• Basin: Colorado Mainstem
• Date: 2/1/1988
• Title: U.S.D.A. Selected Plan - Big Sandy River Unit
• Water Supply Pro - Doc Type: Definite Plan Report

Figure 2-lA (Chapter 2) shows a schematic flow diagram of the water
budget as averaged for the l8-year evaluation period.

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Water not used by crops is percolating into the ground and
dissolving large quantities of salt from the aquifer bedrock, which
is made up of the Bridger and Green River Rock Formations. The
major salts contributing to the total dissolved solids in the Big
Sandy River are sulfates, sodium, and magnesium.

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Annual salt contributions to the Big Sandy River are shown in
Table 2-5 in Chapter 2. The average annual salt loading for the
18-year period (1960-1977) is estimated at 149,180 tons (at Gasson
Bridge) .

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