South Fork & Henry's Fork Fishing Reports

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Henry’s Fork

Jimmy's All Seasons Angler / Henry’s Fork (Page 2)

Henry’s Fork 7-20-19

The lower river, especially below Ashton Dam, is comfortable enough for swimming.  For the river in the Island Park area it is soon time to break out terrestrial insect patterns.  Flows in the river in the Flat Ranch Preserve are beginning to drop, so look for fish there to begin moving to the cooler river below.  The flow there is dominated by the Big Springs outflow, so should be quite hospitable.

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Henry’s Fork 7-13-19

Lower river is definitely warming, so we suggest fishing in the early AM when spinner falls provide some action.  Presenting streamer patterns, especially during early in the day overcast conditions, can bring out some large trout.  Fishing the upper river is more consistent with continuing AM and PM spinner falls and afternoon caddis activity. Look for mayfly populations to begin diminishing from the spring-early summer peak and for bank side terrestrial insects to increase in number.  Depending on weather (mostly thundershowers and resultant winds ) some good fishing can be found in less crowded spots along the river such as the Coffeepot area, the Tubs area, and the Flat Ranch preserve.  Spinner falls, afternoon caddis, yellow sallies, diminishing PMD and golden stones and increasing terrestrial insects will provide interest from trout. From now through Labor Day expect to share the river in Box Canyon and the Big Springs-Mack’s Inn section with floating recreationists.

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Henry’s Fork 7-9-19

On the upper river weather determines intensity and fly-fishing success during the PM brown drake emergence.  Try to use good weather evenings for best chances. Recreating boaters are coming to Box Canyon, and they have the same right to use the river as anglers.   Their numbers peak during mid-day, so to minimize interference consider early AM, or late afternoons for your visit here.  AM and PM spinner falls, afternoon caddis activity, PMD,and beginning-to-diminish flav activity give the best chances for success in the Last Chance-Harriman section.

PM caddis activity and the same spinner falls as on the upper river provide good fishing on the lower river.  Green and gray drakes provide action, but begin fading out there as the river warms.  Another bit of good news is that the South Fork stonefly hatch has transferred many boat away from this part of the river.  This week will see rising air temperatures on the lower river and therefore rising water temps.

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Henry’s Fork 7-6-19

The river in Island Park offers great late afternoon fishing during  caddis activity. Brown drakes are beginning to show up making evening fishing quite interesting.  Double nymph rigs work well in Box Canyon.  AM & PM PMD spinner falls bring trout to the surface.  Green drake are decreasing, but flavs increasing.

All these insects plus gray drakes are available to fish on the lower river where crowds are thinning a bit because fishing on the South Fork is  taking off.

Be aware of the two construction zones  on Highway 20 impacting travel to the river and beyond. We have given details on how to avoid hold-ups on the highway climbing Ashton Hill if you intend to fish in Island Park (use the Mesa Falls Scenic Highway).  The other significant construction zone on the highway,  the re-surfacing of the Lorenzo Bridge across the lower South Fork, impacts travel to the lower and upper river. Here the highway is down to two lanes for about four miles and accommodating the increasing traffic can mean delays of up to twenty minutes until piled-up traffic dissolves. Certainly, try not to be on this part of the highway during  “rush hour ” times

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Henry’s Fork 7-2-19

The lower river continues to offer the best and most consistent fishing. Some flavs, PMDs, a few goldens, caddis and even a few terrestrial insect attract fish.  Look for boating crowds to diminish as the South Fork fishing improves.  Weather conditions make fishing on the upper river a bit inconsistent.

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Henry’s Fork 6-25-19

The great fishing on the lower river continues.   Flavs have showed up, some green drakes remain. PMDs are present  and PM caddis provide action.We have not heard a lot about the gray drake emergence. It’s is not what it use to be ten years ago in terms of number, but late afternoons and evening are the best times to try it (streamers work well during these times of day). The Chester backwater is one of the best locations especially on using a boat to get around shorelines.

Wind and cool temperatures have impacted fishing on the upper river. Predicted warm weather will bring aquatic insect activity  back to seasonal norms.

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Henry’s Fork 6-22-19

Green and grey drakes, flavs and PMDs are coming out on the lower river,  fish are hitting these very well, and word is out.  This shifts fly-fishers from the upper river as well as bringing in those in waiting.  So both places are well attended.  Looking for a Henry’s Fork location with fewer fly-fishing attendees but with good fishing?  Try the river in the Nature Conservancy’s Flat Ranch. It’s really the Henry’s Fork according to the USGS even though the rest of us call it Henry’s Lake Outlet.

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Henry’s Fork 6-18-19

The lower river offers the most consistent fishing with green drakes, PMDs, golden stones, and caddis all offering action for dry fly enthusiasts. If nymphing is preferred, rubber legs with small bead head droppers, or bead head  nymph patterns by themselves and evening time streamers suffice. Best fishing here is above Chester Dam because Fall River  contributes run-off.   With less variable weather fishing in the upper river would become more consistent.

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Henry’s Fork 6-15-19

Harriman State Park opens today and you can bet that the river within is well populated with fish, fly-fishers, and flying insects (PMDs, increasing green drakes, wind-blown stoneflies, & caddis). A less human-crowded alternative is the lower river where green drakes, PMDs, golden stones, caddis and  left-over giant stoneflies are providing good fishing.

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