Predictive Fly Fishing

Know before you go.

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

The Riverline dashboard for the Madison River: 926 cfs streamflow, 54.3 °F water, a fishability score of 92 out of 100, and a 7-day forecast.
Riverline on a phone: the fishability score, active hatches, and water clarity for the Madison River.
  • Live gauges Flow, water temp, and clarity at every station, hourly.
  • One fishability score Flows, temps, clarity, and hatches in a single 0–100 read.
  • AI condition prediction What's hatching and which flies to tie on, for any date.
16 rivers Hourly updates AI guide included

Create an account to try it free — or go straight to Premium.

Free account

$0

Sign up free to open the full conditions dashboard for all 16 rivers.

  • Live flows, water temp, and clarity
  • Fishability score and daily guide read
  • AI condition prediction, hatches, and fly patterns
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Full access

Riverline Premium

$9/ month

Everything above — plus the tools that pick the river for you.

  • Trip Planner — rank all 16 rivers against the dates you can actually go
  • The Riverline Guide — trained on every fly, hatch, and report; knows today's water
  • Multi-day scoring — score a date range, with analogs from past seasons
  • Saved rivers — your home water and its daily read, one tap away
Get Premium · $9/month →

or $79/year — save 27% · create your account, then pay securely with Stripe · cancel anytime

Why Riverline

Everything you need before you wade in.

Live conditions

Flows, clarity, water temp, and weather — refreshed hourly from USGS gauges and Open-Meteo.

Hatch forecasts

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

The Riverline 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.