Survival of Hatchery Steelhead Released in Mitigation for the Wynoochee Lake Project

摘要

The Wynoochee Dam was built at a river mile 50 of the Wynoochee River in Grays Harbor County and closed in October 1972. Some steelhead and sea-run cuttthroat spawning grounds were permanently flooded by the reservoir, so Washington Department of Game (WDG) agreed with the Crops of Engineers to mitigate for the loss of a run of 1,700 anadromous trout presumed to use that area. Expected total survival was 1,0%, for a release of 170,000 smolts. The agreement (WDG 1967) was based on the assumption that the dam would pass juvenile salmonids and only required replacement of the potential fish production lost due to cration of Wynooche Lake.