Fly fishing across the American West

River atlas.

Track current fishing conditions and forecasts across rivers in the American West.

Explore by stateMontana Six rivers. One complete read.

10 of 10 forecasts fresh / Checked

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Western United States forecast coverage map

River reports are ready in the directory.

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River forecast locationsUS Census / US Atlas
80–100% rating60–79%Below 60%No ratingDashed: stale× Unavailable

All available forecasts

River directory

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Browse every river in the atlas. Open one for recommended flies, hatch windows and fishing approach.

10 rivers in the atlas

  1. South-Central Montana

    Bighorn River

    Fort Smith, Montana

    9/10Excellent
    Fresh forecast
    Flow
    1,840 cfs and steady
    Water
    Unavailable

    Maintain a drag-free drift near the bottom structure where trout are holding in steady tailwater flows.

    Forecast hatches Scuds, Sowbugs, BWOs, Midges, Caddis

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:15 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:15 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Bighorn River at Bighorn, Montana · 06287000. The forecast point may differ from the gauge location.

  2. Northeastern Utah

    Green River

    Flaming Gorge, Utah

    8/10Good
    Fresh forecast
    Flow
    2,170 cfs and steady
    Water
    59°F

    Maintain a drag-free drift close to weed beds and gravel runs where trout feed on drifting nymphs.

    Forecast hatches Scuds, Midges, Tricos, Caddis, Terrestrials

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:30 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:30 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Green River near Greendale · 09234500. The forecast point may differ from the gauge location.

  3. Western Wyoming / Eastern Idaho

    Snake River

    Jackson Hole and the South Fork region

    8/10Good
    Fresh forecast
    Flow
    5,130 cfs and falling
    Water
    57°F

    Fish clear tailwater glides with long, drag-free drifts, focusing on soft seams and tailouts.

    Forecast hatches Tricos, Baetis, Caddis, Midges, Terrestrials

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:30 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:30 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Snake River near Moran · 13011000. The forecast point may differ from the gauge location.

  4. Western Montana

    Blackfoot River

    Ovando to Bonner, Montana

    7/10Good
    Fresh forecast
    Flow
    734 cfs and falling
    Water
    55°F

    Focus on slower runs, riffle seams, and drop-offs where trout are holding in moderate flows.

    Forecast hatches Baetis, Midges, Caddis, Stoneflies, Terrestrials

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:30 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:30 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Blackfoot River near Bonner · 12340000. The forecast point may differ from the gauge location.

  5. Eastern Idaho

    Henry's Fork

    Last Chance to Ashton, Idaho

    7/10Good
    Fresh forecast
    Flow
    1,150 cfs and falling
    Water
    Unavailable

    Target slow-moving spring creek currents and grassy undercut banks with delicate, drag-free presentations.

    Forecast hatches Baetis, Midges, Terrestrials, Caddis, Tricos

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:45 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:45 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Henrys Fork near Island Park · 13039000. The forecast point may differ from the gauge location.

  6. Southwest Montana

    Madison River

    Ennis, Montana

    7/10Good
    Fresh forecast
    Flow
    863 cfs and falling
    Water
    55°F

    Dead drift close to the bottom in riffles and tailouts where trout are holding in the moderate, falling flow.

    Forecast hatches Baetis, Caddis, Midges, Terrestrials, Stoneflies

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Stale observation · Sep 13, 2026, 6:00 AM MDT
    Water temperature observation
    Stale observation · Sep 13, 2026, 6:00 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Madison River at Ennis · 06040050. The forecast point may differ from the gauge location.

  7. Central Montana

    Missouri River

    Craig, Montana

    7/10Good
    Fresh forecast
    Flow
    3,180 cfs and steady
    Water
    61°F

    Maintain a drag-free drift close to the riverbed in riffles and seam lines.

    Forecast hatches Tricos, Baetis, Midges, Scuds, Caddis

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:45 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:45 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Missouri River near Wolf Creek · 06073600. The forecast point may differ from the gauge location.

  8. Front Range Colorado

    South Platte River

    Deckers, Colorado

    7/10Good
    Fresh forecast
    Flow
    150 cfs and falling
    Water
    Unavailable

    Use a long, delicate leader with precise micro-split shot spacing to maintain a dead drift in clear tailwater currents.

    Forecast hatches Midges, Tricos, Baetis, Caddis, Terrestrials

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Stale observation · Sep 13, 2026, 5:45 AM MDT
    Water temperature observation
    Stale observation · Sep 13, 2026, 5:45 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: South Platte River at Deckers · 06701900. The forecast point may differ from the gauge location.

  9. Southwest Montana

    Gallatin River

    Big Sky to Gallatin Gateway, Montana

    6/10Fair
    Fresh forecast
    Flow
    241 cfs and falling
    Water
    49°F

    Dead-drift tight against riffle seams and drop-offs with a subtle micro-strike indicator.

    Forecast hatches Baetis, Midges, Caddis, Terrestrials, Stoneflies

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Observed Sep 13, 2026, 6:30 AM MDT
    Water temperature observation
    Observed Sep 13, 2026, 6:30 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Gallatin River above Deer Creek, near Big Sky · 06043120. The forecast point may differ from the gauge location.

  10. Southwest Montana

    Yellowstone River

    Paradise Valley, Montana

    6/10Fair
    Fresh forecast
    Flow
    1,720 cfs and steady
    Water
    56°F

    Target foam lines, seams, and drop-offs where trout hold in slightly off-color water.

    Forecast hatches Terrestrials, Baetis, Caddis, Midges, Stoneflies

    Generated

    Full forecast
    Forecast timing & sources
    Forecast generated
    Sep 13, 2026, 7:00 AM MDT
    Valid until
    Sep 14, 2026, 7:00 AM MDT
    Source updated
    Sep 13, 2026, 7:00 AM MDT
    Flow observation
    Stale observation · Sep 13, 2026, 6:00 AM MDT
    Water temperature observation
    Stale observation · Sep 13, 2026, 6:00 AM MDT

    Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

    Configured gauge: Yellowstone River near Livingston · 06192500. The forecast point may differ from the gauge location.

About the forecasts

A forecast with context.

Conditions in context

Buggin forecasts combine river conditions, weather and hatch timing. Ratings describe the forecast’s fishing outlook; they do not measure catches or confirm safe access.

Freshness you can read

Fresh means the API marks the report fresh and it is within its validity window, capped at 24 hours. Stale reports keep their original timestamps. Missing measurements stay unavailable.

Transparent sources

The atlas checks for updates every five minutes while open. Source context: USGS river observations and Open-Meteo weather. Forecast generation and observation times are shown separately for each river.