Patapsco River at Hollofield, MD
USGS Site No: 01589000 • Patapsco River • Baltimore County, MD
Patapsco River at Hollofield, MD on the Patapsco River is currently at 92 cfs (Normal — 40th percentile for this date) . Gage height: 1.68 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 | 55 | |
| 25th | Low threshold | 72 | |
| 50th (Median) | Normal (median) | 107 | Today: 92 cfs |
| 75th | High threshold | 231 | |
| 95th | Very High threshold | 961 |
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 | 135 | — |
| May 27, 2026 | 164 | — |
| May 26, 2026 | 136 | — |
| May 25, 2026 | 198 | — |
| May 24, 2026 | 605 | — |
| May 23, 2026 | 349 | — |
| May 22, 2026 | 81 | — |
| May 21, 2026 | 91 | — |
| May 20, 2026 | 57 | — |
| May 19, 2026 | 48 | — |
| May 18, 2026 | 50 | — |
| May 17, 2026 | 53 | — |
| May 16, 2026 | 55 | — |
| May 15, 2026 | 60 | — |
| Apr 21, 2026 | 70 | — |
| Apr 20, 2026 | 76 | — |
| Apr 19, 2026 | 75 | — |
| Apr 18, 2026 | 72 | — |
| Apr 17, 2026 | 75 | — |
| Apr 16, 2026 | 79 | — |
| Apr 15, 2026 | 86 | — |
| Apr 14, 2026 | 82 | — |
| Apr 13, 2026 | 82 | — |
| Apr 12, 2026 | 83 | — |
| Apr 11, 2026 | 86 | — |
| Apr 10, 2026 | 88 | — |
| Apr 9, 2026 | 89 | — |
| Apr 8, 2026 | 91 | — |
| Apr 7, 2026 | 99 | — |
| Apr 6, 2026 | 123 | — |
Station Information
- USGS Site No
- 01589000
- State
- MD
- County
- Baltimore County
- Coordinates
- 39.3103, -76.7924
- Drainage Area
- 285 mi²
- Datum (ft)
- 186.9
- HUC Code
- 020600031101
Flood Stage Thresholds
- Action Stage
- 9.0 ft
- Flood Stage
- 11.0 ft
- Moderate Flood
- 19.0 ft
- Major Flood
- 25.0 ft
Currently 9.32 ft below flood stage.
Recent Extremes
- Max discharge
-
940 cfsAug 1, 2025
- Min discharge
-
42 cfsSep 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Patapsco River Near Catonsville, MDNormal4.4 mi · 123 cfs
-
Red Run Near Owings Mills, MDNormal6.6 mi · 6 cfs
-
Patapsco River Near Elkridge, MDNormal6.8 mi · 132 cfs
-
East Branch Herbert Run at Arbutus, MDNormal7.2 mi · 1 cfs
-
Gwynns Falls Near Delight, MDNormal9.2 mi · 3 cfs