Northwest Branch Anacostia River near Colesville, MD
USGS Site No: 01650500 • Northwest Branch Anacostia River • Montgomery County, MD
Northwest Branch Anacostia River near Colesville, MD on the Northwest Branch Anacostia River is currently at 8 cfs (Normal — 28th percentile for this date) . Gage height: 1.57 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for June 11 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 | 6 | |
| 25th | Low threshold | 8 | |
| 50th (Median) | Normal (median) | 12 | Today: 8 cfs |
| 75th | High threshold | 17 | |
| 95th | Very High threshold | 52 |
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 28, 2026 | 11 | — |
| May 27, 2026 | 13 | — |
| May 26, 2026 | 16 | — |
| May 25, 2026 | 26 | — |
| May 24, 2026 | 281 | — |
| May 23, 2026 | 90 | — |
| May 22, 2026 | 26 | — |
| May 21, 2026 | 40 | — |
| May 20, 2026 | 22 | — |
| May 19, 2026 | 4 | — |
| May 18, 2026 | 4 | — |
| May 17, 2026 | 4 | — |
| May 16, 2026 | 5 | — |
| May 15, 2026 | 6 | — |
| Apr 21, 2026 | 5 | — |
| Apr 20, 2026 | 5 | — |
| Apr 19, 2026 | 6 | — |
| Apr 18, 2026 | 5 | — |
| Apr 17, 2026 | 5 | — |
| Apr 16, 2026 | 6 | — |
| Apr 15, 2026 | 6 | — |
| Apr 14, 2026 | 6 | — |
| Apr 13, 2026 | 6 | — |
| Apr 12, 2026 | 6 | — |
| Apr 11, 2026 | 7 | — |
| Apr 10, 2026 | 7 | — |
| Apr 9, 2026 | 7 | — |
| Apr 8, 2026 | 7 | — |
| Apr 7, 2026 | 8 | — |
| Apr 6, 2026 | 11 | — |
Station Information
- USGS Site No
- 01650500
- State
- MD
- County
- Montgomery County
- Coordinates
- 39.0655, -77.0294
- Drainage Area
- 21 mi²
- Datum (ft)
- 264.1
- HUC Code
- 020700100201
Flood Stage Thresholds
- Action Stage
- 6.0 ft
- Flood Stage
- 9.0 ft
- Moderate Flood
- 12.0 ft
- Major Flood
- 19.0 ft
Currently 7.43 ft below flood stage.
Recent Extremes
- Max discharge
-
308 cfsJul 14, 2025
- Min discharge
-
1 cfsSep 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Fourmile Run at Alexandria, VALow15.7 mi · 4 cfs
-
Patapsco River Near Catonsville, MDNormal19.2 mi · 123 cfs
-
Patapsco River Near Elkridge, MDNormal19.9 mi · 132 cfs
-
Patapsco River at Hollofield, MDNormal21.1 mi · 92 cfs
-
East Branch Herbert Run at Arbutus, MDNormal21.7 mi · 1 cfs