Henrys Fork- Box Canyon Fish Report for 9-19-2025
The upper river is coming out of Island Park Reservoir at 345 CFS
Henrys Fork- Box Canyon - Island Park, ID (Fremont County)

by Mike Lawson
9-19-2025
208-558-7525
Website
The upper river is coming out of Island Park Reservoir at 345 CFS, with turbidity and algae still posing issues. It seems to be a day-to-day situation with people still finding nice fish in this area. Box Canyon provides good wading opportunities, with nymphing and dead drifting streamers, a great way to find fish. Most of the algae is on top of the water, so you want something that can get through that, though you may be able to find and target some rising fish. We are still hoping that the Ranch picks up in the coming days. We have been hearing word of some mahoganies showing up. We need cooler weather and perhaps rain to kick those fall-time hatches off. You can still head hunt on the ranch with rising fish spread out, but it will be some work. Still better than actual work!
More Reports
Henry's Fork Anglers Reports
for Friday, August 22nd
Henrys Lake: Flows from Island Park Reservoir are now holding steady around 780 CFS
Henrys Fork- Ashton to St Anthony: Hopper fishing remains strong, especially through the mid and lower stretches
Snake River- South Fork: The hopper bite is excellent right now
Madison River : The Madison is in late-summer mode—hopper/dropper rigs are the go-to for covering water
Teton River: The upper Teton continues to fish well with PMDs and terrestrials
Yellowstone Fish Report: Warm water closures remain in place for the Madison, Firehole, and Gibbon
Henry's Fork Anglers Reports
for Friday, July 25th
Henrys Fork- Box Canyon : Flows coming out of Island Park Reservoir have dropped to approximately 1040 CFS
Henrys Fork- Ashton to St Anthony: Flows near Ashton are currently 1770 CFS
Snake River- South Fork: It’s been a busy and fun season on the South Fork!
Madison River : The biggest hatches are behind us but the Madison is still fishing well
Teton River: The Teton is extremely low right now, to the point where the Slide is not an option
Yellowstone Fish Report: The Firehole, Gibbon, Madison and all associated tributaries are closed in the park due to low flows and warm water temperatures
Henrys Lake: Henrys Lake Report

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