Fishing Report - August 14, 2026

Upper Henrys Fork:

Flows in Box Canyon are currently 1012 CFS. 

Box Canyon has been fishing well, mostly nymphing and streamers producing, but if you felt compelled to fish a dry a small purple chubby chernobyl or a Henry’s Fork Golden stone would produce a few rises. Grasshoppers are also in full swing so give a thunder thighs or a small sweetgrass hopper a try. Rubberlegs in black or zebra variations have been the most productive nymph, and zebra midges on black and brown have also been working well. 

Railroad Ranch has been a slow grind for people looking to find rising fish. Water temperatures have been high and most fish are moving to the coldspring sources which are a safe haven once the temperature of the water approaches the high 60’s. Caddis are still available to the fish, and hoppers, ants and beetles would be the best bet to get a fish to come up. Until some cooler nights start to get the mahogany duns out and active, be on the lookout for honey-ants which can swarm in large enough numbers to become an important foodsource, especially after a small thunderstorm moves in. The Mormon Crickets are dwindling, but another hatch is always a possibility.

Lower Henrys Fork:

Flows Below Ashton Dam are currently 1400 CFS.

The lower Henry’s Fork has been seeing an increase in water temperatures which has been dangerous to fish, and making the fishing subpar. We recommend focusing upstream from Ashton Reservoir, or fishing from early in the morning until 1 or 2 pm. The fish bite better, and anything you release will have a much higher chance of survival. Hoppers with a dropper are your most likely bet, as well as dead-drifting a small streamer Warm River to Ashton. Now is the time of year to hike into Cardiac Canyon for those extra motivated. 

South Fork of the Snake: 

Flows near Irwin are currently 11900 CFS.

Flows at Lorenzo are currently 8780 CFS.

The South Fork has been fishing well, with the bite best early in the morning and the evening. PMD’s are still out, and stonefly imitations and grasshoppers work in the late mornings and early afternoons. Purple chubby chernobyls will also be a solid option to hang a rubberlegs underneath, and still pick up some fish. Small white streamers have been a solid option for some of the larger predatory fish chasing fingerling baitfish and smaller trout. Water flows were dropped, and then raised again in the last two weeks, changing conditions on the river. Watch streamflows and know that a drop in the flows out of Irwin dam can make some of the riffles more accessible for wading opportunities.

Madison River: 

Flows Below Hebgen currently 853 CFS

The Madison River has dropped in flow from Hebgen Lake. Hoppers, beetles, and ants are good from 10-3, and around 10 am there should be a solid Trico spinnerfall making an appearance most days between the lakes. My favorite hopper for the Madison this time of year is the More or Less hopper, or a Morrish hopper in yellow. A short PMD nymph or emerger, rubberlegs, or perdigon should do the trick underneath. We also have some Micro Chubby Chernobyls which have been a solid option to imitate smaller terrestrials this time of year.

Teton River:

Flows on the Upper Teton near Driggs are currently 277 CFS 

The Teton River had a slight bump in flows after the most recent rains. Tricos, Rusty Spinners, Damselflies, Hoppers and Ants are available to fish nearly every day. The Gray Drakes are right around the corner, so be prepared with a few of those Hudgens Spinners in your box. If this cooler weather leaves the Driggs area, consider bringing a thermometer and temping the water throughout your day of fishing in order to ensure you aren’t stressing the fish.

Yellowstone National Park:

The park just lifted the hoot owl restrictions with this cool weather pushing in so no need to worry about getting off the water before 2pm.  You can only imagine how happy the fish will be with the overcast weather.  Terrestrials will continue to do the trick on most rivers.  Keep a lookout for rain as Soda Butte and Lamar will blowout easily.  Beetles and ants have been great on Slough Creek. The Yellowstone river will begin to be a great spot for those looking to swing streamers. Overall, a great spot to be this time of year.

Lakes:

Henry's Lake-

Henry’s lake is fishable, but you have to know where the cold water springs are on the lake, and have a watercraft to get to them. Balanced leeches, chronomids, or a cocktail nymph are your best bet. Talk to some locals and do some research otherwise this fishery is best earlier or later in the season.

Hebgen-

The Gulpers are active on the lake, so have Callibaetis and Trico imitations ready to catch a few on the surface. Lots of Damselflies are also flying around. Hard to beat an upright organza Callibaetis, or dropping a cocktail or Callibaetis nymph 6-12 inches under your dry fly of choice. Plan your day accordingly, the wind usually picks up around noon and try to keep fish in the water and release them quickly. The surface temperatures of Hebgen have been in the mid 70’s.