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South Fork Boise River

August 14, 2026

South Fork Boise River fishing report

Map, access and gauges for South Fork Boise River

Past outlook · Aug 26–Sep 2

This outlook’s window has closed. It is the most recent one we have for this water.

The South Fork is holding steady at 814 cfs with water temperatures at a prime 59 degrees, making conditions favorable for wade fishing as we head into early September. Flows are expected to drop in the weeks ahead, so float season is winding down, but wading opportunities remain solid through this outlook window. Look for pinks, Baetis, caddis, craneflies, and terrestrials; tie on Flavs, King Prince, and Rubber Legged Stones to match the mix. Clear skies and calm conditions should continue into the period ahead.

Read this outlook · All 6 outlooks

Water Temp

59°F · Prime temp

Observed

7d ago

Hatch Status

Pinks are still coming off in the afternoons, with Caddis following directly after in the evening.

Conditions

Water is running crystal clear at 1200 cfs with exposed rocks now visible. At 59°F as of August 26, this is prime cold-water fishing. Pinks show in afternoons, followed by good Caddis in the evening. Big buggy dries with dropper rigs work throughout the day.

Gauges

Techniques

  • Big, buggy dries with a dropper or two underneath have been effective throughout the remainder of the day, both through the morning and in the late evening.

Recommended flies

PinksCaddisBuggy driesBullets as droppers