Patapsco River Near Elkridge, MD
USGS Site No: 01589035 • Patapsco River • Howard County, MD
Patapsco River Near Elkridge, MD on the Patapsco River is currently at 132 cfs (Very High — 95th percentile for this date) . Gage height: 5.76 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 | 47 | |
| 25th | Low threshold | 57 | |
| 50th (Median) | Normal (median) | 71 | |
| 75th | High threshold | 130 | |
| 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 | 200 | — |
| May 27, 2026 | 237 | — |
| May 26, 2026 | 193 | — |
| May 25, 2026 | 294 | — |
| May 24, 2026 | 921 | — |
| May 23, 2026 | 561 | — |
| May 22, 2026 | 118 | — |
| May 21, 2026 | 145 | — |
| May 20, 2026 | 93 | — |
| May 19, 2026 | 70 | — |
| May 18, 2026 | 72 | — |
| May 17, 2026 | 74 | — |
| May 16, 2026 | 77 | — |
| May 15, 2026 | 85 | — |
| Apr 21, 2026 | 88 | — |
| Apr 20, 2026 | 95 | — |
| Apr 19, 2026 | 93 | — |
| Apr 18, 2026 | 90 | — |
| Apr 17, 2026 | 94 | — |
| Apr 16, 2026 | 100 | — |
| Apr 15, 2026 | 109 | — |
| Apr 14, 2026 | 100 | — |
| Apr 13, 2026 | 99 | — |
| Apr 12, 2026 | 101 | — |
| Apr 11, 2026 | 105 | — |
| Apr 10, 2026 | 108 | — |
| Apr 9, 2026 | 108 | — |
| Apr 8, 2026 | 112 | — |
| Apr 7, 2026 | 124 | — |
| Apr 6, 2026 | 160 | — |
Station Information
- USGS Site No
- 01589035
- State
- MD
- County
- Howard County
- Coordinates
- 39.2273, -76.7230
- Drainage Area
- 312 mi²
- Datum (ft)
- 10.1
- HUC Code
- 020600031102
Flood Stage Thresholds
- Action Stage
- 10.0 ft
- Flood Stage
- 15.0 ft
- Moderate Flood
- 19.0 ft
- Major Flood
- 21.0 ft
Currently 9.24 ft below flood stage.
Recent Extremes
- Max discharge
-
1,410 cfsAug 1, 2025
- Min discharge
-
45 cfsSep 15, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
East Branch Herbert Run at Arbutus, MDNormal1.9 mi · 1 cfs
-
Patapsco River Near Catonsville, MDVery High2.7 mi · 123 cfs
-
Patapsco River at Hollofield, MDNormal6.8 mi · 92 cfs
-
Herring Run at Sinclair Lane at Baltimore, MDVery High10.9 mi · 41 cfs
-
West Branch Herring Run at Idlewylde, MDNormal12.5 mi · 1 cfs