Idaho · river

South Fork Boise

The Boise River is a 102-mile-long (164 km) tributary of the Snake River in the Northwestern United States. It drains a rugged portion of the Sawtooth Range in southwestern Idaho northeast of Boise, as well as part of the western Snake River Plain. From Wikipedia

Length
93 mi
Basin
4,100 sq mi
Flows into
Snake River

Flow now

Boise River At Glenwood Bridge Nr Boise ID, 11 mi from the river.

239cfsat build, Nov 12, 11 AM MT

0165329Oct 12Nov 11

The typical week here, from 10 years of record: 248 cfs to 272 cfs, around 266 cfs.

Also gauged at Mores Creek Ab Robie Creek Nr Arrowrock Dam ID: 39 cfs, Nov 12.

Snowpack

0.1 in of water in the snow at Bogus Basin and 2 more stations, against a median 0.6 in for the date (16 % of normal).

The snowpack here usually builds from Nov 9, peaks Apr 7 and is gone by May 20; runoff follows the melt.

The season, November

Usually workable this week. Pick your window and fish it well.

  • Midgessizes 18 to 22
  • Small eggs and worms
  • Pheasant tail and zebra midge nymphsunder an indicator

Typical for the week over 10 years: 248 to 272 cfs. Running 239 cfs today, inside that range. Flows are not forecast; check the gauge the day before.

Brown Trout are spawning (October to December). Stay off clean, light-coloured gravel in riffle tails and pool tailouts, and leave paired fish alone.

Brook Trout are spawning (September to November). Stay off clean, light-coloured gravel in riffle tails and pool tailouts, and leave paired fish alone.

Mountain Whitefish are spawning (October to December). The egg bite behind spawning whitefish is the best winter nymphing of the year: an egg pattern below the riffles.

  • Egg patterns in the runs below the spawning gravel, never on it.

Written by the app's rules engine from the calendar, the gauge record and the snowpack, not by hand, so it says only what the data says. The weather for the week comes with the app.

Fly shops on this water

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Open South Fork Boise in FlyMaster for today's plan, the flies, and your own log here.

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Flows from the U.S. Geological Survey, snowpack from the NRCS SNOTEL network, text from Wikipedia (CC BY-SA 4.0). Built Nov 12.