Grew up on the lower Kettle cr, kinda a sister to Catfish cr ( Pt Bruce). There are fairly good run's of bow's in the spring. Farm I lived on had a couple feeder, cold water stream's, but shallow. Often found huge bow's, more or less land locked, way upstream, as stream's went shallow after spring. Guess they were waiting for a summer storm to add water and they could escape, and it usually happened.
But I do bet they stage in-front of these creek's, pre spawn?
Some will tell you, your taking the breeder's, I've also seen stat's that it is a wasted spawn with less than 2% survival rate, from factory, put and take stocking program's?
I'm sure there will be some replies from folk's who have knowledge here, but please post if you fish them.