Seems to me that credit for Lake Washington sockeye belongs to a U.S. Fish & Wildlife biologist named Kemmerich who stocked eyed Baker Lake sockeye eggs in Issaquah Creek and the Cedar River from 1936 to 1940. He stocked many lakes in western Washington to increase sockeye production, but Lake Washington turned out to be the only sustainable run.
The Army Corps of Engineers built the Ballard locks, changing the Lake Washington outlet from the Renton area near Black River to the Montlake cut, through Lake Union, and the locks. I don't think that had much to do with creating or maintaining the sockeye run.
The Muckleshoots have championed the cause of maintaining the sockeye population as a viable fishery, but I didn't know they were the sole supporters.
WDFW (formerly WDF in this case) set the Lake Washington sockeye spawning escapement goal at 350,000 as the number of spawners that would fully seed available juvenile rearing habitat in Lake Washington. MSY or MSH spawner - recruit analysis most likely wouldn't support so high an escapement goal, as frequent flooding seems to limit the supply of fry reaching the lake, not to mention that MSY always sets escapement well below full seeding and maximum productivity. The proposed sockeye hatchery should add stability to the population by reducing flood losses.
Sincerely,
Salmo g.