Time to think terrestrial patterns on streams and shorelines of lakes. That thought applies to almost all Park waters. One exception is the big stoneflies moving up through the Yellowstone River canyon above Gardner. A good way to enjoy fish responding to them is to take a four-mile walk to the river down Blacktail Deer Creek. It’s a big river here, nearly the size of the South Fork reach of the Snake River, and you will have to commit to either side.