Originally Posted by Ernest
I won't fish a "blow out," but usually when a medium sized stream has blow out conditions, I can move to the headwaters or a smaller tributary, and find willing fish in clear water.
The "run off," as opposed to a blow out, is a different matter. In the Midwest we'll have the spring run off, and later we'll have fishable high water after heavy storms. If the water is of a temperature for the fish to be on the feed, the fishing can be very good.
Some people think that blow out conditions wash the trout downstream, away from their regular habitats. A real flood will change the course of the stream and scour away a lot of invertebrates. But in the streams I fish, the trout seem to take advantage of the high water by moving upstream, and the fishing is often better after a high water event than before.
Finally, seasonal high water bring the big fish out of Lake Superior and Lake Michigan and into the streams, where fishermen on foot have a better chance for a big one.