St. Marys River at Sault Ste. Marie, Ontario
USGS Site No: 04127885 • St. Marys River • Chippewa County, MI
St. Marys River at Sault Ste. Marie, Ontario on the St. Marys River is currently at 65,900 cfs (Normal — 27th percentile for this date) . Gage height: 579.82 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 54,400 | |
| 25th | Low threshold | 63,500 | |
| 50th (Median) | Normal (median) | 91,000 | Today: 65,900 cfs |
| 75th | High threshold | 97,100 | |
| 95th | Very High threshold | 0 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 29, 2026 | 71,300 | — |
| May 28, 2026 | 65,400 | — |
| May 27, 2026 | 65,900 | — |
| May 26, 2026 | 60,500 | — |
| May 25, 2026 | 58,700 | — |
| May 24, 2026 | 55,900 | — |
| May 23, 2026 | 62,700 | — |
| May 22, 2026 | 59,000 | — |
| May 21, 2026 | 53,800 | — |
| May 20, 2026 | 59,200 | — |
| May 19, 2026 | 59,300 | — |
| May 18, 2026 | 56,900 | — |
| May 17, 2026 | 56,200 | — |
| May 16, 2026 | 59,200 | — |
| May 15, 2026 | 57,300 | — |
| Apr 21, 2026 | 43,700 | — |
| Apr 20, 2026 | 44,900 | — |
| Apr 19, 2026 | 51,200 | — |
| Apr 18, 2026 | 53,000 | — |
| Apr 17, 2026 | 48,400 | — |
| Apr 16, 2026 | 46,800 | — |
| Apr 15, 2026 | 44,100 | — |
| Apr 14, 2026 | 43,100 | — |
| Apr 13, 2026 | 46,300 | — |
| Apr 12, 2026 | 46,000 | — |
| Apr 11, 2026 | 44,200 | — |
| Apr 10, 2026 | 45,900 | — |
| Apr 9, 2026 | 46,800 | — |
| Apr 8, 2026 | 43,100 | — |
| Apr 7, 2026 | 44,600 | — |
Station Information
- USGS Site No
- 04127885
- State
- MI
- County
- Chippewa County
- Coordinates
- 46.4983, -84.3153
- Drainage Area
- 80,900 mi²
- Datum (ft)
- 578.0
- HUC Code
- 04200002
Recent Extremes
- Max discharge
-
93,600 cfsJun 8, 2025
- Min discharge
-
22,800 cfsFeb 22, 2026
Computed from the local daily-values archive.
Nearby Gauges
-
Pine River Near Rudyard, MINormal25.6 mi · 125 cfs
-
Tahquamenon River Near Paradise, MILow45.7 mi · 628 cfs
-
Black River Near Garnet, MINormal56.6 mi · 21 cfs