Au Sable River At Mio, Mi Realtime Data
AU SABLE RIVER AT MIO, MI
Realtime Data • Report • Conditions
1,060
Discharge (cfs)
3.3
Gauge Height (ft)
Streamflow discharge was last observed at 1,060 cfs, and a gauge height of 3.25 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 1,095 .
Weather today, Tomorrow,
The river is fed by multiple tributaries and contains a variety of aquatic species including brook trout, brown trout, and smallmouth bass. There are several dams along the river, including the Mio Dam, which was built in the early 1900s and provides hydroelectric power. Seasonal trends include higher flows in the spring due to snowmelt and rain, and lower flows in the summer and fall. Interesting facts include the Au Sable River being a designated National Wild and Scenic River, and that it was featured in Ernest Hemingway’s novel, The Big Two-Hearted River.
July 21, 2026
| Elevation | 946.0 ft |
| Last Updated | |
| Gage height, ft | 3.25 ft |
| Stream water level elevation above NAVD 1988, in ft | 932.4 ft |
| Streamflow, ft³/s | 1060.0 ft3/s |
| Dissolved oxygen, water, unfiltered, mg/L | 8.4 mg/l |
| Temperature, water, °C | 20.1 deg C |
| Percent of Normal | 120% |
| Year Over Year Average | 883 cfs |
| 24hr Flow Prediction | cfs |
| Maximum Recorded | 7,500 cfs |
| Geolocation | 44.66, -84.13 |
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