When honey ants show up on the river in the Harriman-Last Chance reach, fishing will really pick up. We cannot recommend the river below Ashton Dam as a great fishery until after Labor Day. The best fishing on the lower river now is between Warm River and Ashton. Try streamers, big nymph and rubber leg patterns under low light conditions. During day time hours slam (from a boat) or drop (while wading) hopper or hopper-like patterns beneath overhanging vegetation. Try the same with ant, adult cranefly and beetle patterns.
Henry’s Fork 8-12-15
Henry’s Fork 8-8-15
Looks like Henry’s Lake Outlet part of the river is now diminishing as a quality fishery for the year. That’s because flow out of Henry’s Lake has dropped meaning shallower and warming water. This will move fish downstream to the Henry’s Fork. For the near future you can find them in the Tubs area above Mack’s Inn. Try streamer patterns. For the rest of the river presenting terrestrial patterns is the best way to fishing success.
Henry’s Fork 8-4-15
AM and PM spinner falls and daytime terrestrial insects (particularly ants and hoppers) are providing most of the action on the upper river. So have patterns for these available. Are you fishing the river in Harriman State Park just before and after sunset? Don’t be shy about offering a hair mouse pattern along grassy banks especially if deeper water is nearby. Big Daddy may be waiting! In middle reaches of the river terrestrial insect and caddisfly life cycle patterns rule the effectiveness roost, particularly during PM hours. On the river below Ashton Dam warmer waters are present, so early in the day visits require spinner patterns, rusty and otherwise. Caddisfly and terrestrial insect patterns are appropriate for later in the day. Also be sure to have streamer patterns ready as sundown comes about.
Henry’s Fork 7-28-15
It’s time to break out those terrestrial patterns for fishing the upper river. Except for speckled duns, upcoming tricos, and late season BWOs, the big mayfly emergences are over. Long drifts of ant, hopper and beetle patterns in front of bank side cover where water has some depth will one of the best places to target. Breezes will help not only to help obscure your presence, but help drop bugs into the water.
Henry’s Fork 7-21-15
This morning flow out of Island Park Dam was increased by 900 cfs to 2000 cfs to test low-head hydro turbines at Chester Dam. Flow will remain at 2000 cfs for two-three days, then at least by Friday, July 24th, should be returned to around 1000 cfs. Because of this near doubling in flow, take caution while wading and consider that there will be some reaction from fish. By this coming weekend, fishing success should return to what it was last weekend. By then consider that hopper and other terrestrial insect patterns are going to be increasingly important occupants in your fly box anywhere along the river.
If you wish to get away from the effects of the flow increase, consider trying the river (Henry’s Lake Outlet to some folks) in the Flat Ranch Preserve. Flow out of Henry’s Lake Dam is nearly 100 cfs,and cooling effects on shallow, slow running water through nighttime heat radiation help fish stay active. Therefore morning spinner falls can bring good responses from them and terrestrial insect activity should interest them well into daytime hours.
Henry’s Fork 7-18-15
There are plans to significantly increase the flow out of Island Park Dam on July 22nd-23rd in order to test turbines at the Chester Dam low head hydro facility during July 23rd-24th. This short but significant increase is sure to temporarily impact fishing on much of the river. Final figures on flow will not be established until Monday, July 21st. When we see more information on this action, we will post such here.
Henry’s Fork 7-14-15
Flow out of Island Park Dam was dropped to 1310 cfs from near 1700 cfs yesterday. This means easier wading in the river in Box Canyon, Last Chance-Harriman -Riverside and below, but more of a tendency for the river to warm a bit.Early AM spinner falls and later in the day flav and caddis activity still interest fish, but terrestrial insects are coming on. Try fishing these times for another reason—–fewer visitors. Frequent thundershowers have helped cool things off during evenings.
Flow out of Ashton Dam has dropped a bit (2600 cfs to 2300 cfs) and is subject to irrigation demands. Fishing between here and Chester dam remains fair with best times for action being early and late in the day. Don’t overlook using terrestrial insect patterns any time you visit the river, here and anywhere else.
Henry’s Fork 7-11-15
As is usual this time of year, fishing on the river from Ashton Dam downstream has slowed as waters have warmed significantly. Early AM spinner falls and evening caddis activity can bring some action. Also try streamers at twilight.
Henry’s Fork 7-4-15
Drake hatches in the Last Chance-Harriman stretch are pretty much over. Now it is on to flavs with PMDs. During these hot dry days fishing early morning spinner falls with your favorite rusty spinner pattern is not only pleasant but productive. The river below Ashton Reservoir is warming meaning slowing action. Evening caddis activity and AM spinner falls is best time to fish. Below Chester Dam irrigation demands have lowered and warmed the river to the point it’s hardly worth a visit. There is some action on the Flat Ranch section of the Henry’s Lake Outlet section for those folks using PMD life cycle and dry damselfly patterns. But if a bigger early season flush had taken place a lot more fish would be present.
Henry’s Fork 6-23-15
The Last Chance-Harriman State Park reach of the river is crowded, and rightfully so. One way to beat the crowds is to try the early morning or evening spinner fall. Green drakes and PMDs are going strong, and caddis are everywhere. Any day now brown drakes in the evening will become significant. On the lower river, Warm River to Ashton and below Ashton Dam, caddis and PMDs and diminishing golden stoneflies attract fish. As with the upper river ant and beetle patterns fished near banks will interest fish. It looks like this will be a lean year for gray drakes in the evenings, but this time of day can be great for presenting streamers around stream side cover out of direct sunlight.