About this river
Rocky River is a 7.4 mile stream near Fawn River Kayak Guide and Rental in Michigan. Streamflow is measured at the USGS gauge ST. Joseph River at Three Rivers, MI (site 04097500). The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1953 to 2026
Rocky River typically runs highest in April, at a median 1,955 cfs, and lowest in September, at 560 cfs. The highest flow on record for any single day is 9,530 cfs, in 2018.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,160 | 793 to 1,600 | |
| February | 1,210 | 846 to 1,890 | |
| March | 1,920 | 1,420 to 2,520 | |
| April | 1,955 | 1,440 to 2,515 | |
| May | 1,580 | 1,200 to 2,130 | |
| June | 1,050 | 713 to 1,640 | |
| July | 720 | 504 to 1,010 | |
| August | 570 | 416 to 800 | |
| September | 560 | 395 to 727 | |
| October | 658 | 479 to 965 | |
| November | 870 | 600 to 1,230 | |
| December | 1,080 | 719 to 1,490 |
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 64 years of record. Statistics published by the US Geological Survey for ST. Joseph River at Three Rivers, MI (site 04097500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Rocky 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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