Au Sable River level at Grayling
Michigan · Paddling & whitewater
Measured at USGS 04136000 — AU SABLE RIVER NEAR RED OAK, MI · NWS forecast point RDOM4
Reading taken · as of 18 min ago
Up — bigger, pushier water than average
At 832 CFS, this gauge is running 134% of normal for mid-September — above the 619 CFS median USGS has recorded for this date across 36 years of record (1909–2026). The stage is 2.8 ft below the NWS action stage of 6.0 ft.
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Flood stages at Grayling
National Weather Service categories for gauge RDOM4, WFO APX. Impact wording is the NWS's own, verbatim.
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Major flood 9.0 ft
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Moderate flood 8.0 ft
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Minor flood 7.0 ft
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Action 6.0 ft
- Right now 3.20 ft
NWS forecast: 3.20 ft by .
Flow history at Grayling
Daily values from USGS 04136000, updated every 15 to 60 minutes; NWS forecast for RDOM4 reissued through the day. Provisional.
Highest crests on record at Grayling
12 on record
| Stage | Flow | Date |
|---|---|---|
| 8.88 ft | 4,835 CFS | Apr 14, 2026 |
| 6.88 ft | 3,200 CFS | Apr 15, 2014 |
| 6.69 ft | 3,049 CFS | Oct 24, 2017 |
| 6.66 ft | 3,300 CFS | Apr 1, 1998 |
| 6.39 ft | 2,980 CFS | Apr 7, 1997 |
| 6.18 ft | 2,770 CFS | Apr 1, 2016 |
| 6.06 ft | — | Feb 11, 2021 |
| 5.99 ft | 2,730 CFS | Apr 19, 2013 |
| 5.95 ft | — | Dec 27, 2008 |
| 5.92 ft | 2,517 CFS | Apr 1, 2025 |
Crests published by the National Weather Service.
About Au Sable River at Grayling
In Michigan — the reading paddlers, anglers and outfitters here check before committing to a shuttle. Holy Waters; livery cluster and the Canoe Marathon.
Au Sable River at Grayling — common questions
3 questions
How fast can Au Sable River at Grayling come up?
Fast. It is free-flowing, so rain upstream moves it directly. Several feet in a few hours is normal after a heavy storm.
Is Au Sable River at Grayling high or low for this time of year?
The USGS median flow for mid-September here is 619 CFS, from 36 years of record (1909–2026). Today is 134% of it. The comparison is what makes the raw number mean anything: the same reading is a drought on one river and a flood on another.
How often does this reading update?
USGS transmits from gauge 04136000 every 15 to 60 minutes, and the National Weather Service reissues the flood forecast for RDOM4 a few times a day — more often when the river is rising. This page refreshes from both when you open it. The timestamp is in the gauge's local time.