RUNnGun-

WDFW produce a report a few years back "O. mykiss": Assessment of Washington State's steelhead populations and programs. That should be available by searching their site (might try Statewide steelhead plan and look for that report. Within the report there are a number of appendixes that provide historical data base for various regions of the State. While the smolt planting history is by no means complete but on some of the larger basin it can go back to about 1960.

For complete information contact the agency directly (either the fish program in Olympia or the regional office).

Curt