Prosser Reach: Difference between revisions

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Fall Chinook: Migration, Spawning, Rearing
Fall Chinook: Migration, Spawning, Rearing


Summer Chinook: No longer occur in Yakima Basin?
Summer Chinook: Migration, Rearing


Spring Chinook: Migration, Rearing
Spring Chinook: Migration, Rearing

Revision as of 12:37, 14 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.

TMDL list or table

Fish Use

Fall Chinook: Migration, Spawning, Rearing

Summer Chinook: Migration, Rearing

Spring Chinook: Migration, Rearing

Sockeye Salmon: Migration

Coho Salmon: Migration

Steelhead Trout: Migration

Bull Trout

Lamprey

Pikeminnow

Smallmouth Bass

Channel Catfish

Smolt Survival

Limiting Factors

Hydrograph/Flow

Water Quality - Stream Temperature

Water Quality - Pesticide and Herbicide

Water Quality - Fine Sediment

Predation

Floodplain habitat degradation

Citations

  1. 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.