Looking good, Fishing great!!!!
Lamar River- This has been a great early season on the Lamar, the fish have been on the feed, there have been some great hatches, PMD's, caddis and some hoppers making thier annual appearence. Hopper/dropper rigs with all the basic beadheads, ants and beeteles are working well and if for some reason it becomes a bit off color big nymphs and streamers will work.
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.
Soda Butte Creek-Same as the Lamar report.
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.