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South Fork Boise River

September 1, 2026

South Fork Boise River fishing report

Map, access and gauges for South Fork Boise River · Fish species · Hatches · Guides

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Outlook · Sep 30–Oct 7

The South Fork is holding steady at 309 cfs with water at 51 degrees heading into early October. Expect Pinks, Flavs, and Baetis to feed during the warmer parts of the day, with small cream-colored crane flies in the mix. The evening caddis hatch remains worth fishing after sunset. As flows stabilize, consider heavier line and bigger attractors near the water's edges where fish relocate into newly accessible lies.

Read this outlook · All 11 outlooks

Water Temp

56°F · Prime temp

Observed

30d ago

Conditions

As of September 25, flows had settled to 304 cfs and water temps hit 51 degrees, moving into prime conditions as the river continues dropping through fall. With flows easing, more of the river opens for wading. Expect overlapping hatches of pinks, BWOs, October caddis, and craneflies as evenings cool, giving you plenty of options to match. Consider heavier line and bigger attractors near the edges as water levels drop.

Gauges

Recommended flies

Elk Hair Caddis #10-12 orangeCranefly patternsThorax Dun Flavs #14-16Comparaduns #16-20Thorax Pinks #14-18Parachute Pinks #14-18Pat's RubberlegsSmall mayfly nymphs

Access

Declining flows open more of the river for wade fishing as water levels drop.