Northern Yellowstone: Gardner River below Osprey Falls, Lava Creek below Undine Falls, Lamar River below Cache Creek, all of Slough Creek, Soda Butte Creek below Amphitheater Creek, and the Yellowstone River below Seven Mile Hole.
West side of the park: Madison River, Firehole River below Keppler Cascades, and the Gibbon River below Gibbon Falls.
Southern portion of Yellowstone: Bechler River below Ouzel Creek, Falls River below Rainbow Falls, Mountain Ash Creek below Union Falls, Proposition Creek, Boundary Creek below Dunanda Falls, Robinson Creek, and the Snake River below Six Mile Ford.
.. Hebgen Lake is fishing very well in the mornings and - for that matter - through the heat of the day. Evening streamer fishing is also picking up. Gulper fishing is exceptional on these dog-day mornings with the lake like glass and the mosquitoes still asleep. Dawn is not too early to arrive, but the gulping hits high gear between 7:30 and 8:30 AM.
.. There is an abundance of flies on the water and the hatches are strong and consistent. Callibaetis & Trico spinners and emergers are the key here - keep it small, about 16 or thereabouts is close. When the wind comes up go to nymphs and keep fishing. The windward shores are producing good fish in the afternoon and evening on small streamers and Montana Dusters.
.. The Madison River below the Hebgen Dam is crowded and fishing well despite the pressure. Some evening caddis are working in this tailwater stretch. Deep drift Prince Nymphs and Montana Dusters between hatches. Be on the lookout for Hoppers and fish 'em if you got 'em.
.. The Gallatin River is fishing very well. Caddis is the strong suite here along with a few hatches of PMD's and some Yellow Stones keep the action in this coldwater going. Hopper action is in full swing and a hopper-dropper combination with an Hare's Ear or Feather Duster will reward you. Watch where you park and be careful with your turns and slowings - the increased fire traffic make the road a bit busier than usual.
.. A gentle walk up the Fan Creek trail to the narrow sections and the meadows is worth it. Small attractors and nymphs will produce some sterling action and occasionally a bragging fish of 10" - 12". Be very sneaky in the open areas.
.. Some of the best advice for fishing the Soda Butte Creek [early and often,] Lamar River [take a walk,] and Slough Creek [good as the terrestrials are - leave it alone,] in the northeast corner of the park comes from Bud Lilly's:
.. Tired of tame fishing and wily trout? Tired of elbows and egregious fishers? Tired of cars and diesel buses and the other accouterments of our advanced civilization? Walk into the Bob Marshall Wilderness and catch willing fish on a string - from the Bozeman Chronicle.
.. Want to see some exquisite photos of the molting process of the Black Quill? Go to Troutnut.com - spectacular! There's a lesson here for fly tiers.