Patapsco River Near Catonsville, MD
USGS Site No: 01589025 • Patapsco River • Baltimore County, MD
Patapsco River Near Catonsville, MD on the Patapsco River is currently at 123 cfs (Very High — 95th percentile for this date) . Gage height: 10.80 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 | 41 | |
| 25th | Low threshold | 53 | |
| 50th (Median) | Normal (median) | 65 | |
| 75th | High threshold | 118 | |
| 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 28, 2026 | 189 | — |
| May 27, 2026 | 226 | — |
| May 26, 2026 | 186 | — |
| May 25, 2026 | 276 | — |
| May 24, 2026 | 866 | — |
| May 23, 2026 | 508 | — |
| May 22, 2026 | 113 | — |
| May 21, 2026 | 132 | — |
| May 20, 2026 | 78 | — |
| May 19, 2026 | 58 | — |
| May 18, 2026 | 60 | — |
| May 17, 2026 | 63 | — |
| May 16, 2026 | 67 | — |
| May 15, 2026 | 76 | — |
| Apr 21, 2026 | 82 | — |
| Apr 20, 2026 | 90 | — |
| Apr 19, 2026 | 86 | — |
| Apr 18, 2026 | 81 | — |
| Apr 17, 2026 | 84 | — |
| Apr 16, 2026 | 90 | — |
| Apr 15, 2026 | 99 | — |
| Apr 14, 2026 | 92 | — |
| Apr 13, 2026 | 93 | — |
| Apr 12, 2026 | 94 | — |
| Apr 11, 2026 | 99 | — |
| Apr 10, 2026 | 103 | — |
| Apr 9, 2026 | 105 | — |
| Apr 8, 2026 | 109 | — |
| Apr 7, 2026 | 120 | — |
| Apr 6, 2026 | 154 | — |
Station Information
- USGS Site No
- 01589025
- State
- MD
- County
- Baltimore County
- Coordinates
- 39.2513, -76.7638
- Drainage Area
- 301 mi²
- Datum (ft)
- 66.3
- HUC Code
- 020600031101
Flood Stage Thresholds
- Action Stage
- 18.0 ft
- Flood Stage
- 20.0 ft
- Moderate Flood
- 25.0 ft
Currently 9.20 ft below flood stage.
Recent Extremes
- Max discharge
-
1,220 cfsAug 1, 2025
- Min discharge
-
43 cfsSep 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Patapsco River Near Elkridge, MDVery High2.7 mi · 132 cfs
-
East Branch Herbert Run at Arbutus, MDNormal3.9 mi · 1 cfs
-
Patapsco River at Hollofield, MDNormal4.4 mi · 92 cfs
-
Red Run Near Owings Mills, MDVery High10.6 mi · 6 cfs
-
Herring Run at Sinclair Lane at Baltimore, MDVery High12.1 mi · 41 cfs