Au Sable River - Mainstream (below Mio)

Lake Huron tributary · Gauge: Au Sable River near Au Sable, MI

Current Conditions

63°F

Water Temp · falling

1,080

Flow (cfs) · steady

3.28ft

Gage Height

Reading: 6/17/2026, 3:45:00 AM

Run status

Brown Trout

Confidence: 63%

FADING

Why this status?

Phase: ramp_down. Water 63.1°F (ideal 45-65), flow 1080 cfs (ideal 600-1800). 0 reports in last 24h (weighted 7d: 0.00, trust-adjusted). Window/Temp/Flow/Reports scores: 0.55/1.00/1.00/0.17 → total 0.63.

Chinook Salmon

Confidence: 41%

NOT YET

Why this status?

Phase: before. Water 63.1°F (ideal 52-62), flow 1080 cfs (ideal 1000-2400). 0 reports in last 24h (weighted 7d: 0.00, trust-adjusted). Window/Temp/Flow/Reports scores: 0.00/0.89/1.00/0.17 → total 0.41.

Steelhead

Confidence: 19%

DONE

Why this status?

Phase: after. Water 63.1°F (ideal 38-50), flow 1080 cfs (ideal 900-2200). 0 reports in last 24h (weighted 7d: 0.00, trust-adjusted). Window/Temp/Flow/Reports scores: 0.00/0.00/1.00/0.17 → total 0.19.

Recent reports

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Typical run windows

Brown Trout 04-01 → peak 06-15 → 09-30

Ideal: 45-65°F · 600-1,800 cfs

Hex hatch late May/early June.

Chinook Salmon 08-25 → peak 09-20 → 10-25

Ideal: 52-62°F · 1,000-2,400 cfs

Au Sable mainstream salmon run — Foote Dam holds fish.

Steelhead 10-15 → peak 11-30 → 04-30

Ideal: 38-50°F · 900-2,200 cfs

Famous trophy steelhead water.

Status is computed from real-time USGS gauge data, historical run windows, DNR reports, and crowdsourced angler reports. Always confirm conditions with the latest DNR rules before fishing.