Predictive Fly Fishing

Know before
you go.

Real-time flows, hatch forecasts, and AI guidance for 16 rivers across Montana, Idaho, Wyoming, and Canada.

16 rivers 30-min updates AI guide included
Open Riverline →

Free while in beta · no sign-up required to explore

Why Riverline

Everything you need before you wade in.

Live conditions

Flows, clarity, water temp, and weather — updated every 30 minutes from USGS gauges and Open-Meteo.

Hatch forecasts

Verified hatch calendars for every river, adjusted in real time by water temp and seasonal timing.

Ask the guide

An AI trained on local reports and conditions data. Ask what's working, where to wade, what to tie on.

Coverage

16 rivers. One forecast.

Montana, Idaho, Wyoming, and southern Alberta — the rivers that matter most.

Western Montana

  • Bitterroot River
  • Clark Fork River
  • Blackfoot River
  • Rock Creek

Central & SW Montana

  • Madison River
  • Missouri River
  • Big Hole River
  • Beaverhead River
  • Yellowstone River
  • Gallatin River
  • Bighorn River

Idaho & Wyoming

  • Henry's Fork
  • South Fork Snake River
  • Snake River

Canada

  • Bow River
  • Elk River

Fishability Score

See conditions at a glance.

One number synthesizes flows, temps, clarity, and hatch data — so you spend less time guessing.

Stay in the loop

Now live across the Northern Rockies.

New rivers and features land through the season — get them in your inbox.