Susquehanna River at Conowingo, MD
USGS Site No: 01578310 • Susquehanna River • Harford County, MD
Susquehanna River at Conowingo, MD on the Susquehanna River is currently at 66,400 cfs (High — 88th percentile for this date) . Gage height: 15.12 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 | 11,200 | |
| 25th | Low threshold | 16,700 | |
| 50th (Median) | Normal (median) | 26,100 | |
| 75th | High threshold | 32,900 | |
| 95th | Very High threshold | 84,800 | Today: 66,400 cfs |
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 | 62,000 | — |
| May 27, 2026 | 49,000 | — |
| May 26, 2026 | 63,400 | — |
| May 25, 2026 | 41,600 | — |
| May 24, 2026 | 31,500 | — |
| May 23, 2026 | 26,600 | — |
| May 22, 2026 | 18,400 | — |
| May 21, 2026 | 24,200 | — |
| May 20, 2026 | 36,900 | — |
| May 19, 2026 | 33,600 | — |
| May 18, 2026 | 48,200 | — |
| May 17, 2026 | 41,200 | — |
| May 16, 2026 | 43,400 | — |
| May 15, 2026 | 29,500 | — |
| Apr 21, 2026 | 54,400 | — |
| Apr 20, 2026 | 55,000 | — |
| Apr 19, 2026 | 44,300 | — |
| Apr 18, 2026 | 38,400 | — |
| Apr 17, 2026 | 37,700 | — |
| Apr 16, 2026 | 36,000 | — |
| Apr 15, 2026 | 46,800 | — |
| Apr 14, 2026 | 54,300 | — |
| Apr 13, 2026 | 55,600 | — |
| Apr 12, 2026 | 49,100 | — |
| Apr 11, 2026 | 58,700 | — |
| Apr 10, 2026 | 67,200 | — |
| Apr 9, 2026 | 98,100 | — |
| Apr 8, 2026 | 105,000 | — |
| Apr 7, 2026 | 112,000 | — |
| Apr 6, 2026 | 114,000 | — |
Station Information
- USGS Site No
- 01578310
- State
- MD
- County
- Harford County
- Coordinates
- 39.6579, -76.1744
- Drainage Area
- 27,100 mi²
- Datum (ft)
- 4.1
- HUC Code
- 020503061713
Flood Stage Thresholds
- Action Stage
- 21.5 ft
- Flood Stage
- 23.5 ft
- Moderate Flood
- 24.8 ft
- Major Flood
- 28.5 ft
Currently 8.38 ft below flood stage.
Recent Extremes
- Max discharge
-
185,000 cfsMay 9, 2025
- Min discharge
-
3,840 cfsNov 16, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Deer Creek Near Darlington, MDLow2.9 mi · 138 cfs
-
Octoraro Creek Near Richardsmere, MDNormal4.6 mi · 158 cfs
-
Swan Creek at Swan Creek, MDNormal9.5 mi · 6 cfs
-
Bynum Run at Bel Air, MDNormal11.5 mi · 6 cfs
-
James Run Near Belcamp, MDNormal12.3 mi · 6 cfs