About this river
Saint Clair River is a 34.7 mile river near Lake St. Clair Guide in Michigan. Streamflow is measured at the USGS gauge ST. Clair River at Port Huron, MI (site 04159130). The National Hydrography Dataset places it at stream order 10. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2009 to 2026
Saint Clair River typically runs highest in June, at a median 207,000 cfs, and lowest in February, at 174,000 cfs. The highest flow on record for any single day is 272,000 cfs, in 2021.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 179,000 | 151,000 to 205,000 | |
| February | 174,000 | 148,000 to 199,000 | |
| March | 195,000 | 172,000 to 215,000 | |
| April | 202,000 | 182,000 to 218,000 | |
| May | 205,000 | 184,000 to 218,000 | |
| June | 207,000 | 185,500 to 218,500 | |
| July | 202,000 | 186,000 to 217,000 | |
| August | 204,000 | 188,000 to 220,000 | |
| September | 206,500 | 190,000 to 221,000 | |
| October | 203,000 | 185,000 to 220,000 | |
| November | 202,500 | 185,000 to 217,000 | |
| December | 198,000 | 177,000 to 213,000 |
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 17 years of record. Statistics published by the US Geological Survey for ST. Clair River at Port Huron, MI (site 04159130). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
8 mapped launches sit in the mapped area of Saint Clair River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Saint Clair River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
