Thunder Bay River
Montmorency / Alpena Co. · 70 mi · Class Riffles
—CFS
Loading…Optimal: 200–800 CFS · USGS #04135500
Length
Difficulty
Optimal
Avg Flow
Hist. Median
USGS Gauge
None
Flowing to Lake Huron at Alpena and the Thunder Bay National Marine Sanctuary, this northeastern LP river offers a scenic paddle through forested country to one of the Great Lakes' most significant underwater preserves.
Trip sections
Upper — Atlanta to Hillman, narrow forest paddle
Lower — Hillman to Alpena, wider current to Lake Huron
Outfitters
Thunder Bay River Outfitters
Canoe and kayak rentals in Alpena County
72-Hour Flow Forecast
NOAA NWPSLoading forecast...
10-Year Flow Patterns
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Your Optimal Range
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Data Quality
River conditions are community-verified. CFS ranges, difficulty ratings, and trip sections may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level. If you spot an error, use the Improve This River button at the top of the page — your local knowledge is what makes this atlas accurate.