Au Sable River near Au Sable, MI

River level and flood forecast · Iosco County

Normal8.5 ftas of Mon 11:30 PM

Flow: 1,150 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

18.35 ft — April 13, 2026
16.27 ft — March 28, 1991
16.02 ft — March 29, 1989
15.76 ft — April 1, 1998
15.43 ft — July 4, 1994

Recent crests: 18.35 ft (April 13, 2026) · 9.43 ft (February 17, 2023) · 12.92 ft (April 1, 2022) · 10.81 ft (December 12, 2021) · 10.85 ft (September 8, 2021)

Up and down the river, and nearby

UpstreamAu Sable River near Curtisville (Alcona Dam), MI
East Branch Au Gres River near Alabaster, MI
Au Sable River near McKinley, MI
Au Gres River near Au Gres, MI
Au Sable River at Mio (Mio Dam), MI
Rifle River near Sterling, MI
Au Sable River near Red Oak, MI
Thunder Bay River near Bolton, MI

See it on the live map →Radar & warnings for Iosco County NWS gauge page USGS gauge 04137500

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ASBM4); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.