South Fork Boise River

July 8, 2026

By Barbless, compiled each morning from the gauges, forecasts and sources on this page.

South Fork Boise River

Current conditions for South Fork Boise River · Map, access and gauges

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Water Temp

56°F · Prime temp

Observed

42d ago

Hatch Status

There are still a few Salmonflies fluttering around and fish will still look up for them, but if they are refusing, size down.

Conditions

The South Fork is fishing variable right now, with results heavily dependent on hatch timing. Dense hatches can shut down feeding for 12-24 hours afterward, but when fish are active on the surface, big dry bugs work well. Salmonflies are still present but fish may refuse them; try scaling down in size and adjusting color if you get refusals. Emerger fishing under the surface produces on tougher days. As of September 27, flows were normal at 309 cfs and wading conditions should improve as the season progresses toward fall.

Gauges

Techniques

  • When you hit it right, be ready to throw big bugs on top. Chubby Chernobyls, Water Walkers, Dancin Rickys, and Cicadas have all been producing.
  • If you are getting refusals, change up the color or size before you abandon the dry fly game, and always consider hanging a dropper below for fish that are keyed into emergers just under the surface.

Recommended flies

#16-20 Flashback Pheasant Tail#18 Olsen's Pheasant Tail#18-20 Silver Duracell#8-10 Knotty Hooker#4 Godspeed Stone Brown#16-18 Red Neck#14-16 Yardley's Low Hole#16-18 Rosa Red Tag Jig#16-18 Rosa Orange#18-20 Burkus Baetis Cripple#16 Rusty Hackle Spinner#18-20 Last Chance Cripple BWO#18-20 Infrequent#10-12 Royal Chubby Chernobyl#8 Purple Chubby Chernobyl#8-10 Fat Albert Tan#10 Fat Head Cicada#8 Elden's Red Ant#10 Dancin Ricky Purple#8 Water Walker Stone

Access

The river is closed April 1 until the Friday before Memorial Day Weekend.