I have a copy of the original US Fish & Wildlife Service report by the biologist who first planted Baker Lake origin sockeye in the Cedar River and also Issaquah Creek too, if I remember correctly. This occurred after the Cedar was diverted into Lake Washington from the Black River and the Lk WA outlet changed from the Black River to the Lake Union ship canal and the Ballard locks.

As far as I know, the Cedar had an endemic native run of both steelhead and Chinook. There is no logical reason why they wouldn't since the Cedar historically had ready access to anadromy.