East Branch Ontonagon River in Michigan
Around here
Around East Branch Ontonagon River
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
East Branch Ontonagon River is a 49.0 mile river. Streamflow is measured at the USGS gauge Ontonagon River near Rockland, MI (site 04040000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1942 to 2026
East Branch Ontonagon River typically runs highest in April, at a median 3,385 cfs, and lowest in August, at 599 cfs. The highest flow on record for any single day is 31,200 cfs, in 1942.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 780 | 660 to 920 |
| February | 773 | 640 to 900 |
| March | 900 | 733 to 1,240 |
| April | 3,385 | 1,680 to 5,575 |
| May | 1,270 | 854 to 2,380 |
| June | 890 | 682 to 1,380 |
| July | 721 | 542 to 976 |
| August | 599 | 457 to 775 |
| September | 643 | 466 to 839 |
| October | 747 | 580 to 1,190 |
| November | 969 | 697 to 1,390 |
| December | 870 | 666 to 1,100 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 84 years of record. Statistics published by the US Geological Survey for Ontonagon River near Rockland, MI (site 04040000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of East Branch Ontonagon River. Ramp data comes from the USGS national boat-ramp inventory.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show East Branch Ontonagon River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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