Prosser Reach: Difference between revisions
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Revision as of 14:28, 11 August 2025
Overview
The Prosser Reach is approximately 9 miles long beginning just below the Yakima/Benton County border at river mile 51 and ending at Snipes Creek at river mile 41.8.
Tributaries
Spring and Snipes Creeks
Facilities
Prosser Diversion Dam at river mile 47
Chandler Canal
Prosser Sewer Treatment Plant
Prosser Hatchery and Enumeration Facility
Hydrology
Flow
Target flows below Prosser and Sunnyside diversion dams were established under the authority of Federal Congressional legislation (Title XII; Public Law 103-434)
Initial target flows ranged from 300 to 600 cubic feet per second depending on water supply estimates.
Habitat Conditions
Water Quality
Stream Temperature
Water temperatures often exceed 26 degrees Celsius, below Prosser[1]. Low base flows contribute to the problem.
Fish Use
Fall Chinook: Migration, Spawning, Rearing
Summer Chinook: No longer occur in Yakima Basin?
Spring Chinook: Migration, Rearing
Sockeye Salmon: Migration
Coho Salmon: Migration
Steelhead Trout: Migration
Bull Trout
Lamprey
Pikeminnow
Smallmouth Bass
Channel Catfish
Limiting Factors
Hydrograph/Flow
Water Quality - Stream Temperature
Water Quality - Pesticide and Herbicide
Water Quality - Fine Sediment
Predation
Floodplain habitat degredation
Citations
- ↑ Snyder, E. B., and J. A. Stanford. 2001. Review and Synthesis of River Ecological Studies in the Yakima River, Washington, with Emphasis on Flow and Salmon Habitat Interactions. Flathead Lake Biological Station, University of Montana, Polson, MT.