Most of the Steelhead comming over the falls are headed to the N. Santiam, it's the only upper Willamette trib that has a decent run of winter fish. Doesn't mean you can't catch a steelhead below the dam. Anytime the water levels drop enough you can catch summers in the system waiting to spawn. The Corp of engineers fish biologist fishes all year Dexter to Pengra all year long and almost always catches fish.