Thunder Bay River near Bolton, MI
River level and flood forecast · Alpena County
Normal11.9 ftas of Tue 12:30 AM
Flow: 415 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Highest crests on record
- 19.63 ft — April 15, 2026
- 18.88 ft — April 5, 2026
- 18.24 ft — October 26, 2017
- 17.99 ft — April 2, 2016
- 17.89 ft — March 25, 2022
Recent crests: 19.63 ft (April 15, 2026) · 18.88 ft (April 5, 2026) · 17.19 ft (April 2, 2025) · 15.6 ft (April 15, 2024) · 16.8 ft (April 7, 2023)
Up and down the river, and nearby
- Au Sable River near McKinley, MI
- Au Sable River near Curtisville (Alcona Dam), MI
- Au Sable River at Mio (Mio Dam), MI
- Pigeon River (N Lower MI) near Vanderbilt, MI
- Au Sable River near Red Oak, MI
- North Branch Au Sable River at Kellogg's Bridge near Lovells, MI
- Sturgeon River at Wolverine, MI
- Au Sable River near Au Sable, MI
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (BOLM4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.