I believe that steelhead will behave a lot like coho in that they will attempt to get as far upstream as is possible given streamflows. They may hold around the release site for a while but if prevented from entering (going "upstream") they will likely look elsewhere. This is especially so as the fish reach maturity.

Also, the males will hang around longer, looking for females. The hens will spawn and boogie back to sea. The males will keep looking to spawn.