Henry's Fork Fishing Report - July 23, 2026

Henry’s Fork Streamflows

Island Park Dam:  1400 cfs

Ashton Dam:  1820 cfs

St. Anthony:  1190 cfs

Fall River:  405 cfs

The Henry’s Fork has been holding up this July, with better conditions than expected prevailing so far.  Flows have recently been reduced and clarity is looking great at the moment.  Fishing has been fair to good overall in the river upstream of Ashton Reservoir.  Mormon crickets are still around in crazy numbers on some days, seemingly from Osborne Bridge and downstream, so keep a few big foam beetles or hoppers handy at all times.  Afternoon thundershowers have been fairly common and not always predictable, so be sure to keep a rain jacket packed in your kit, even on the sunniest of mornings!

Box Canyon

The Box has been fishing well and giving anglers good action with indicator nymphing rigs and dry/dropper rigs on most days.  A fair number of golden stoneflies are still flying around, giving some potential dry fly opportunity for anglers looking for a dry fly run.  For goldens, we like the HF Stone, BSA Razorback, Mimic Hopper, and Jojo’s Golden in addition to the standard Chubby varietals.  For nymphs, we are liking the following, not much changing since last week:  PTs, R/L Tactical PTs, Rednecks, Olive HP Caddis Pupas, Hare/Copper #14-16; Rubberlegs , BSA Jig Rubberlegs and 101 Stones #8-12;  red and brown Zebra Midges #14-18.  A selection of perdigons is handy as well:  Spanish Bullets, Bullet Quills, PMD Frenchies, Red Jig Napoleons, Olive Hot Spots and Black Daggers will all produce results.  Be sure to check your flies for weeds frequently, these Box Canyon rainbows don’t take their meals with salad attached!

Railroad Ranch

The Ranch has been producing mixed results this week, dropping flows are likely making trout move around a bit, but are also conducive to rising trout.  There are decent numbers of bugs around in the mornings, anglers are on their own to seek opportunities after 2pm, hard to say what each day may bring.  Mormon crickets aren’t exactly reliable, but there are some serious trout eating them from time to time, you’ll want to keep some size 4-6 hoppers and beetles handy for when those opportunities arise.  There are spinners of a variety of sizes and colors around, gray drakes, flavs, pmds, callibaetis, tricos and baetis are all worth keeping stocked in your fly boxes.  Some caddis around from time to time as well, and now is certainly the time to make sure you stock up on flying ant patterns.  Flows and clarity are ideal for decent days of fishing on the Ranch, it’s worth taking your fly rod for a walk this week, but expect challenging conditions and wary trout!

Canyon Country

Flows are ideal for ventures into the canyons of the Henry’s Fork, there are still golden stones around and waves of Mormon crickets from time to time.  As ever, anglers should plan on having a subsurface option in play as well, we like a dry/dropper situation down here on most days, but solid dry fly activity can be reason enough to cut off the dropper and enjoy an hour or two of surface fishing and enjoyable casting.  Afternoon thundershowers will sneak up on you quickly in here, so don’t forget your rain jackets and extra layers. 

Warm River to Ashton

Despite the heat in the low country, this section has a strong input of cold water right at the top with the addition of the flows from Robinson Creek and the Warm River.  These tributaries bring a daily refresh to the system and keep the trout in this section happy on most days.  Some great fishing is to be had down here with good action on small to medium sized trout.  Indicator nymphing, dry/dropper, and dry fly rigs are all welcome here.  Each day holds the potential of larger trout as well, especially with these Mormon crickets around.  For flies, we like the same selection as that for the Box Canyon.

Below Ashton Reservoir

Best to leave these sections alone for the next weeks as hot days in the valley are pushing water temperatures too high for quality fishing and safe recovery of trout.  If anglers do venture down here, keeping a close eye on water temperatures should be considered mandatory behavior, avoiding anything over 70 degrees. 

Get out there and have fun!