The big attraction here is browns becoming active in migrating to spawning areas. Run-up browns (and rainbows) from Hebgen Lake are beginning their move into the Madison River and on to the lower Gibbon River. In the Lewis River system browns are moving from both Shoshone and Lewis Lakes into the river between the two lakes as well as into the river just below Lewis Lake. In total, this Lewis River system run makes the largest concentration of brown trout in park waters. Later this fall the Gardner and Snake River runs will be worth trying. Fishing during low light conditions will be the best time to encounter any of these these fish. Presenting streamers during these times is the best strategy, but large nymphs presented deep also brings results.