Today
56°F
Mostly Sunny
NW 10 mph · 0% precip
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Today’s verdict
Clear — a big 34°F swing through the day.
826 CFSFlow
50°F−1°Water temp
826 CFS is right around its typical level for October — this stretch typically runs 633–908 CFS.
Wading tends to be more manageable at typical flows, but beds shift and cold water saps strength fast — read the water, stay within your limits, and check conditions on-site. You remain responsible for your own safety.
At 50°F, the water is in the prime range for trout — cold enough to fish and to handle fish safely.
Weather
55°FClear
Wind NW 8 mph
Sunrise 8:11 AM · Sunset 6:29 PM
Observed (2 hours ago)
NWS / weather.gov · fetched 17:01
Today
56°F
Mostly Sunny
NW 10 mph · 0% precip
Tonight
25°F
Mostly Clear then Patchy Fog
NW 0 to 5 mph · 1% precip
Tomorrow
59°F
Patchy Fog then Mostly Sunny
S 0 to 5 mph · 3% precip
Conditions are estimates from USGS data. Always assess on-site conditions and use your own judgment.
The gauge near Red Oak reads the Au Sable on the mainstem below Mio, downstream of the famous "Holy Water" fly-only reach around Grayling. It carries both flow and water temperature, so the read reflects the river's volume and warmth. We don't yet have a clean shop-report source for the Au Sable, so this page ships conditions only — the gauge and weather, without a fly list — until a usable source is curated.
Location
© OpenStreetMap contributors · © Geoapify
Helpful Links
Michigan fishing resources
Michigan’s classic cold-water river, known for cedar-lined channels, long pools and an influential dry-fly tradition. Target species include Brown, brook and rainbow trout. Excellent public access and canoe launches; wading varies by branch and substrate. Productive timing is Late April through June for major hatches, then summer evenings and fall streamer fishing. Major hatches and foods include Hendricksons, sulphurs, brown drakes, hex, isonychia, caddis and olives. Common approaches are Dry flies and emergers during hatches; night fishing, mice and streamers for larger browns. Regulations, access rules and water conditions vary by reach, so anglers should review current agency information and the linked local reports before fishing.