Monocacy River near Frederick at Interstate 70

Last updated: Jul 23, 2025, 6:36 AM UTC
No watches, warnings or advisories are in effect for this area.

Flood Impacts 🅘

  • 30 - Water reaches the second floor of Gambrill Mill on the Monocacy National Battlefield.
  • 24 - Water approaches Urbana Pike near Monocacy National Battlefield.
  • 21 - Maryland Route 26 is flooded near the Monocacy River bridge.

Gauge Info

Coordinates 39.4028, -77.3661
RFC MARFC
State MD
WFO LWX
County Frederick
Data Provider(s)
US Geological Survey USGS--Water Resources of the United States
USGS 01643000

Gauge Location

Recent Crests

1. 17.75 ft on 01-10-2024 (P)
2. 19.04 ft on 09-24-2021
3. 22.10 ft on 09-02-2021
4. 15.83 ft on 05-01-2020 (P)
5. 16.62 ft on 05-06-2019

Historic Crests

1. 35.90 ft on 06-23-1972
2. 30.80 ft on 09-26-1975
3. 28.10 ft on 08-24-1933
4. 25.38 ft on 10-10-1976
5. 23.67 ft on 01-20-1996

Vertical Datum Table

type NAVD88
major Flooding 251.21 ft
moderate Flooding 248.21 ft
minor Flooding 246.21 ft
action 244.21 ft
Latest Value 233.22 ft
Gauge Zero 231.21 ft

Gauge Photos

No Images Found

Probability Information

Photo 1 of 3

Unique Local Info

Potential River Levels - Used to

Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble GEFS Ensemble

Note: Use the official hydrograph at the top of this web page for river levels within the next 72 hours.

Click individual graphics to enlarge.

Collaborative Agencies

The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.

WFO Information

Weather Forecast Office
(Baltimore/Washington) Sterling
43858 Weather Service Rd.
Sterling, VA 20166
Official Homepage