RiverFinn
Au Sable — South Branch (Mason Tract)
Au Sable River · Michigan · Freestone
Chase Bridge downstream through the Mason Tract to Smith Bridge
- Brook Trout
- Brown Trout
What RiverFinn tracks here
The sources, not today's numbers — those live in the app, with their observation times. This is what exists for the stretch, what does not, and where each figure comes from so you can check it yourself.
Measured by a thermometer on the water (USGS), with its own observation time. Never estimated from the weather.
Official source ↗Today's flow compared with 58 years of historical observations for this calendar date at the gauge.
Reference only: Michigan Department of Natural Resources does not publish per-reach notices RiverFinn can read. The app links to the official page; check it before you go.
Official source ↗1 standing rule from Michigan Department of Natural Resources, shown in the app with their source.
Official source ↗Fish Au Sable — South Branch (Mason Tract) with the facts.
Today's flow, the forecast, any closure and Finn's read — in the app.