Flows coming out of Island Park Reservoir have dropped to approximately 1040 CFS

Henrys Fork- Box Canyon - Island Park, ID (Fremont County)


by Mike Lawson
7-25-2025
208-558-7525
Website

Flows coming out of Island Park Reservoir have dropped to approximately 1040 CFS. We’re still seeing a few Golden Stones fluttering about the Box Canyon as well as Hoppers, Caddis, and Mayflies. The tried and true dry-dropper is always a good place to start. Tie on a big foam dry such as a Purple Chubby Chernobyl or Juicy Hopper Tan and drop a bead headed nymph 12-15 inches below. You could use a variety of colors and kinds with this set up. The Harriman Ranch has been tough recently, but if you take your time and really study the water watching for risers you might get lucky. Your best chances will be during the most pleasant times of the day – think earlier in the morning and later in the evening. You might see a variety of Mayfly spinners such as Flavs, PMDs, and Callibaetis. Caddis have been out heavily in the evenings and as the dry weather persists we will see more terrestrials. Make sure you have some Splitsville Rusty Spinners, Spent Partridge Caddis, and Quick Sight Beetles in your box. 



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