Interactive Maps
Mount Vernon to Anacostia River
Search Potomac Sites
Also Explore
| The Hudson River Guide | The Delaware River Guide |
| NEW! The Connecticut River Guide | |
Monocacy River
Maryland Tributary
The Monocacy is the third largest tributary of the Potomac, after the Shenendoah River and the Anacostia River. The river flows 58.5 miles starting in northern Maryland, and drains an area of 744 square miles, the largest Maryland tributary to the Potomac. In 1974, the river was designated as a Maryland Scenic River, but it suffers from a serious problem with runoff and sedimentation.
Suggested Links
Contact Information
Maryland Department of Natural Resources
VA
Website