WSP11270

• File Number: 8273.500
• Description: Colorado River Basin Salinity Control - Federal Agencies - EPA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1990
• Title: EPA - Rural Clean Water Program - RCWP
• Water Supply Pro - Doc Type: Report/Study

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· Snake Creek"Utah: Snake Creek is a minor tributary to Deer Creek
Reservoir, a he~vily. used recreational resource and water supply for
about 500,000 p~ple. Eutrophication and bacterial problems in the reser-
voir are caused qoly partly by nutrient and bacterial loadings from Snake
Creek. SuccessfLiI treatment of all eight animal operations in the 700-acre
project area has ; reduced both average phosphorus concentration and
fecal coliform lev.ls by about 90 percent. The success of the RCWP has
led to spin-off imRlementation in other parts of the watershed, resulting in
measured water Cluality improvements in Deer Creek Reservoir.

EPA Region X

· Rock Creek, I~aho: Fishing and contact recreation in Rock Creek
were impaired by sediment, bacteria,and other pollutants discharged into
the creek from irrigation ditches., Early installation of sediment retention
structures and irrigation management systems, followed by a gradual shift
to conservation tillage, has resulted in measured decreases in suspended
sediment levels arid a steady increase in rainbow and brown trout popula-
tions.

· Tlllamook Bay,:Oregon: This 11,OOO-acre bay supports a $1.5 million
shellfishing industrY and recreation at a level of about 70,000 user-days.
Bacterial contami~ation from over 100 dairies has caused frequent
closure of the she)rtishing beds and health risks for recreational users.
With about 60 percent of the animal waste under proper management, the
mean fecal coliforn\ concentration has bee" reduced by 40 to 50 percent.

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