South Fork Boise River

July 3, 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

50°F · Prime temp

Observed

70d ago

Conditions

Water temperature is holding at 50°F as of August 9, putting the South Fork in prime thermal range for aggressive feeding. Big, buggy dry flies paired with stonefly nymphs remain the most effective combo, and substantial foam patterns continue to draw interest in the bright conditions. Stoneflies and caddis are hatching well, especially in bright light. This run fishes best as a float.

Gauges

Techniques

  • Floating is the way to go
  • Big foam up top is certain to pick up fish
  • Big, buggy dries with a stonefly underneath have proved very effective
  • Buggy dries and stonefly nymphs

Recommended flies

Buggy driesStonefly nymphsBig foam patterns