Yellowstone River, Fishing

First time fishing the Yellowstone River and I lucked out by hitting the Mother's Day Caddis hatch. Though I missed out on the emergence, there were millions along the bank and some were egg laying. Flows were about 4k and rising. I think the next day or so the river was blown out with runoff. Too many whitefish... if the hundred or so whitefish were instead trout, it would have been one of the greatest days ever fishing, LOL. I did mange to find a few trout here and there.