: Yellowstone Rivers: Both the Firehole and Madison are having hatches of big White Caddis. Blue Wings are the main hatch that will be Park wide. You can still get some fish to eat a terrestrial. More so, your ants and beetles than the hoppers. If you have a cricket pattern with you it may work better than a hopper. They can survive into the fall better because they spend the night underground. If you enjoy lake fishing, head down to Lewis Lake. The Lake Trout will be moving into shallower water to look for spawning grounds. They prefer to drop their eggs into boulder piles. Or you could help the Park Service and pull a few out of Yellowstone Lake. Get here soon, these are the last few weeks that the Park is open for fishing.