Ontonagon HUC8 04020102
A 3,596 km² sub-basin of the Great Lakes region in MI, WI. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
69
Moderate
Drought index
191
Moderate
Area in D2+
27.7%
0% exceptional (D4)
Gauges below normal
25%
of 4 reporting
Median flow
80%
p27 of record
Water assets
2,685
0 springs · 21 wells
USGS gauges (4)
- CISCO BRANCH ONTONAGON R AT CISCO LAKE OUTLET, MI040375001 cfsp16 · below normal
- MIDDLE BRANCH ONTONAGON RIVER NEAR PAULDING, MI0403300094 cfsp25 · normal
- ONTONAGON RIVER NEAR ROCKLAND, MI04040000498 cfsp29 · normal
- WEST BRANCH ONTONAGON RIVER NEAR BERGLAND, MI0403600041 cfsp53 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 191 | 27.7 | 1/4 | p27 |
Top water assets
- 67Victoriareservoir
- 66Bond Falls Control Damreservoir
- 65West Branch Ontonagon River Near Bergland, Miriver
- 65Ontonagon River Near Rockland, Miriver
- 65Ontonagon Riverriver
- 65Cisco Branch Ontonagon R At Cisco Lake Outlet, Miriver
- 65Trout Creek Damreservoir
- 65West Branch Ontonagon Riverriver
- 65Lower Damreservoir
- 65Hubbell Creekriver