Longest run I did on the SR was a huge king when they were first coming back, from the lower part of the staircase pool to the flat below, and would have probably ended up at the wall above the black losing the fish but someone stepped in and netted. The guy with the zebco and striped pants above his hip boots was vocally impressed to see the green butt bear in the corner of the mouth! Chased a steelhead that was way over 20 (9 jumps) on the Maplewood side of the Genny from the power plant hole to just above Seth Green Island, where he broke the 12 lb mainline on my drift rig, and on the GIS that measures about 3/8 mile. I was young and foolish then, now I look at that stretch from the other side of the river and all I see is broken legs, and I don't even go down on that side anymore as the path in is known for putting people in casts.
If this weather holds up, you can get your salmon pre-steamed up around the staircases, this is too hot and humid after that wonderful 70's with 50 at night last week.