› Rivers & Lakes › Pennsylvania
River PA MD VA

Monocacy River

Pennsylvania • 39.7053, -77.2164
Hydrography profile Updated Dec 30, 2025
Checking mapped path coverage…
USGS and NOAA data is for informational purposes. Source notes
Length
59 mi
94 km
Elevation
361′ → 191′
170 ft drop
Stream Order
7
Large River
Slope
0.06%
2.9 ft/mi
Drainage
923 mi²
2,391 km²
Avg Flow
1,425 cfs
1.8 mph velocity
Path to Mouth
298 mi
479 km to ocean
Classification
Tributary
Mid-reach
Elevation Profile
Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

EPA WQP MyWaterway
Loading the interactive map…
Data from USGS & NOAA for informational purposes only. Read source and safety notes
Sign in for Alerts

Access Sites on Monocacy River

There are 9 boat ramps, launches, and public access points on Monocacy River.