Great Lakes
Au Sable River
Live Conditions
Au Sable River — Au Sable River near Red Oak, MI
7-Day Flow
↓ Falling
24-Hr Pressure
29.15 inHg · → High/stable
Local Weather
Tough conditions — fish deep
Today
☀️Clear sky
78° / 40°
Tomorrow
☁️Overcast
81° / 46°
Thu
☁️Overcast
83° / 52°
Fri
🌧️Rain showers
70° / 61°
0.44"
Cold front incoming — go deep with nymphs, surface activity likely slow.
Weather by Open-Meteo · No API key · Updated every 30 min
What should I fish today?
One call. Specific to today's exact conditions on the Au Sable River.
9.4
Time of Day
What should I pack?
Rod, flies, tippet, and safety gear specific to today's Au Sable River conditions.
🪰 Hatch Calendar
Au Sable River · June · Early Summer
🟢 Active now at 62.6°F water
🟡 Approaching — within 5°F of trigger range
Select month
SULPHURS at peak (size 16-18) evenings. Caddis (size 14-16) all day. Light Cahills emerging. Late month: HEX hatch begins — the defining Michigan event. Marathon nights of rising 20"+ browns.
🟢 Active · 🟡 Approaching · ⚪ Seasonal only
River Map
About Au Sable River
The Au Sable River is one of the most iconic trout streams in the United States — the eastern equivalent of the Madison. The 'Holy Water' section from Grayling downstream through the Grayling State Forest is a no-kill, artificials-only stretch that produces wild brown trout of legendary size. The Hex hatch in late June and early July draws anglers from across the country for marathon nights of rising fish. Arctic grayling were native to the Au Sable until their extinction around 1936 — Michigan DNR has been studying reintroduction as of 2026.
Regulations
Multiple Type 1 (Gear Restricted) and no-kill artificials-only sections throughout. Holy Water section (Grayling to Burton Landing): no-kill, artificial lures and flies only. Verify exact section boundaries in the current Michigan DNR Inland Trout & Salmon Regulation Guide — boundaries are marked by signs and updated annually. Michigan Fishing License required ($27 resident / $77 non-resident). Season opens last Saturday of April (2026 opener: April 25).