Welcome to launch. We are currently expanding our databases quickly — user input and corrections are needed and appreciated. The content and functions on this site are deep. If you find something that is out of order, please let us know.
Michigan · Unknown Co.

South Branch Ontonagon River

★ Wild & Scenic
· 20 mi · Class
Optimal: 80–250 CFS · USGS #04036000
169 avg
82.6CFS
2.05 ft gauge height
Optimal
→Stable
⚡Flow data is live from USGS·Rapid classifications and CFS ranges need community verification·Know this river?
Avg flow: 169 cfsHist. median: 0 cfsUSGS #04036000
National Wild & Scenic River · Private

About

From the Ewen Carry Down to Victoria Dam, the South Branch Ontonagon runs 20 miles of Wild & Scenic water at 169 CFS average flow. Optimal paddling conditions fall between 80–250 CFS, monitored through USGS gauge 04036000. The river holds Wild & Scenic designation but flows through private land requiring landowner coordination for access.

Solunar Fishing Activity
🌒
Waxing Crescent
15% illumination
Poor
★ Moon overhead
9:28 AM
Moonrise
1:31 PM
Moonset
5:25 AM
★ Moon underfoot
9:28 PM
Next full moon: May 3111 days
10-Year Flow Patterns
See 10 years of flow patterns for this river — historical analysis is a Pro feature.Upgrade to Pro →
Your Optimal Range
Set your personal optimal CFS window per river — custom ranges are a Pro feature.Upgrade to Pro →
Data Quality

River conditions are community-verified. CFS ranges, difficulty ratings, and access points may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level.

Know the South Branch Ontonagon River? Your local knowledge makes this page better for every paddler, angler, and guide who comes after you.
Improve This River →