Potomac River, Adjusted, Near Wash, DC
USGS Site No: 01646502 • Potomac River
Current reading not available.
Nearby gauges with live readings
This gauge isn't reporting right now. These nearby USGS gauges are currently active:
- Fourmile Run at Alexandria, VA 7.7 mi@if($nearby->currentReading) · 4 cfs@endif
- Patapsco River Near Catonsville, MD 28.5 mi@if($nearby->currentReading) · 123 cfs@endif
- Patapsco River Near Elkridge, MD 29.0 mi@if($nearby->currentReading) · 132 cfs@endif
- Patapsco River at Hollofield, MD 30.7 mi@if($nearby->currentReading) · 92 cfs@endif
- East Branch Herbert Run at Arbutus, MD 30.8 mi@if($nearby->currentReading) · 1 cfs@endif
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 | 1,710 | |
| 25th | Low threshold | 2,370 | |
| 50th (Median) | Normal (median) | 3,400 | |
| 75th | High threshold | 6,760 | |
| 95th | Very High threshold | 23,700 |
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.
10th–95th historical
Day-of-year median
Recent discharge
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| Oct 31, 2025 | 3,100 | — |
| Oct 30, 2025 | 2,710 | — |
| Oct 29, 2025 | 1,930 | — |
| Oct 28, 2025 | 1,910 | — |
| Oct 27, 2025 | 1,970 | — |
| Oct 26, 2025 | 1,990 | — |
| Oct 25, 2025 | 1,960 | — |
| Oct 24, 2025 | 2,050 | — |
| Oct 23, 2025 | 2,090 | — |
| Oct 22, 2025 | 2,170 | — |
| Oct 21, 2025 | 2,120 | — |
| Oct 20, 2025 | 2,210 | — |
| Oct 19, 2025 | 2,000 | — |
| Oct 18, 2025 | 2,020 | — |
| Oct 17, 2025 | 2,060 | — |
| Oct 16, 2025 | 2,060 | — |
| Oct 15, 2025 | 2,220 | — |
| Oct 14, 2025 | 2,200 | — |
| Oct 13, 2025 | 2,270 | — |
| Oct 12, 2025 | 2,330 | — |
| Oct 11, 2025 | 2,320 | — |
| Oct 10, 2025 | 2,000 | — |
| Oct 9, 2025 | 1,980 | — |
| Oct 8, 2025 | 2,020 | — |
| Oct 7, 2025 | 1,950 | — |
| Oct 6, 2025 | 1,990 | — |
| Oct 5, 2025 | 2,050 | — |
| Oct 4, 2025 | 2,180 | — |
| Oct 3, 2025 | 2,330 | — |
| Oct 2, 2025 | 2,340 | — |
Station Information
- USGS Site No
- 01646502
- State
- MD
- Coordinates
- 38.9498, -77.1276
- Drainage Area
- 11,560 mi²
- Datum (ft)
- 37.2
- HUC Code
- 02070008
Recent Extremes
- Max discharge
-
136,000 cfsMay 15, 2025
- Min discharge
-
1,910 cfsOct 28, 2025
Computed from the local daily-values archive.
Nearby Gauges
-
Fourmile Run at Alexandria, VANormal7.7 mi · 4 cfs
-
Patapsco River Near Catonsville, MDVery High28.5 mi · 123 cfs
-
Patapsco River Near Elkridge, MDVery High29.0 mi · 132 cfs
-
Patapsco River at Hollofield, MDNormal30.7 mi · 92 cfs
-
East Branch Herbert Run at Arbutus, MDNormal30.8 mi · 1 cfs