Lamar River- The Lamar River is just getting fishable. The run off has kept is high and muddy. Soda Butte Creek-Same as the Lamar River. Watch our for thunder storms in this area as they cause flash floods and muddy water.
Attractors, bead head nymphs and woolly buggers
Slough Creek-Looking great and fishing great! PMD's, drakes, ants and beetles are a favorite. midges can work all season if they get tough and General beadheads from 12 through 22 can fool'em.
Yellowstone River- Fishable but be very careful working around it.
Gardner River- Up and cold, not a strong option, navigating it will be limited, probably give it a bit.
Firehole River- White Millers, some PMD's and there are Salmonflies reported in the canyon stretch. Always a great place to swing soft hackled patterns.
Gibbon River- Muddy up high, it is fishable and a good opportunity to throw streamers in the meadow stretch, attractor patterns and dry-dropper rigs will do well at the falls.
You can check out the parks Fishing Home page for dates, licensing and fishing related info HERE.