Montana · river

Gallatin River

The Gallatin River is a tributary of the Missouri River, approximately 120 mi (193 km) long, in the U.S. states of Wyoming and Montana. It is one of three rivers, along with the Jefferson and Madison, that converge near Three Forks, Montana, to form the Missouri. From Wikipedia

Length
120 mi
Basin
1,793 sq mi
Rises at
Gallatin Range
Flows into
Missouri River

Flow now

Gallatin River near Gallatin Gateway, MT, 4 mi from the river.

345cfsat build, Nov 12, 12 PM MT

0227453Oct 12Nov 11

The typical week here, from 10 years of record: 367 cfs to 442 cfs, around 391 cfs.

Also gauged at Gallatin River above Deer Creek, near Big Sky, MT: 237 cfs, Nov 12.

Snowpack

0.8 in of water in the snow at Lick Creek and 2 more stations, against a median 2.6 in for the date (30 % of normal).

The snowpack here usually builds from Oct 30, peaks Apr 21 and is gone by May 21; 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: 367 to 442 cfs. Running 345 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.

Nearby waters

Every Montana water

Open Gallatin River 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.