RIVER GAUGE · SUSQUEHANNA RIVER
Susquehanna River at Conowingo Dam
Cecil County, Maryland
Water level12.23 ft
Flow24,000 cfs
Last readingSep 16, 2026, 4:35 PM UTC (last recorded)
Action21.5 ft220,000 cfs
Minor flood23.5 ft288,000 cfs
Moderate flood24.8 ft336,000 cfs
Major flood28.5 ft528,000 cfs
The past week
Loading chart…
What floods at each level
- 31 ft
Notification level 9 with 43 to 53 gates open at Conowingo dam.
- 29.4 ft
Notification level 8 with 36 to 42 gates open at Conowingo Dam.
- 28.5 ft
Notification level 7 with 33 to 35 gates open at Conowingo Dam.
- 26.3 ft
Notification level 6 with 26 to 32 gates open at Conowingo Dam.
- 24.8 ft
Backyards and basements on Main Street and Tome's Landing begin to flood.
- 23.7 ft
Minor flooding begins in the town of Port Deposit, Maryland.
- 22.9 ft
Maryland Route 222 north of Port Deposit is closed.
- 21.5 ft
Notification level 2 with 12 to 15 gates open at Conowingo Dam.
- 20 ft
Notification level 1 with 10 to 11 gates open at Conowingo Dam.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Jun 23, 1972 | 36.83 ft | 1,130,000 cfs |
| Jan 19, 1996 | 34.18 ft | 909,000 cfs |
| Sep 9, 2011 | 32.41 ft | 777,700 cfs |
More on Susquehanna River
UpstreamSusquehanna River at Marietta
Get an alert when Susquehanna River rises
Save this gauge in the free StormCast app and pick the level that matters to you. Your phone goes off when the water gets there.
