Muddy Branch is a tributary stream of the Potomac River in Montgomery County, Maryland, United States, located about 14 mi northwest of Washington, D.C.

Course

The headwaters of the stream originate in Gaithersburg, and the stream flows southwest for 11.9 mi, through Muddy Branch Park and Blockhouse Point Conservation Park, under the Chesapeake and Ohio Canal near Pennyfield Lock, to the Potomac River.

Tributaries

Recreation

Parts of Muddy Branch flow through Blockhouse Point Conservation Park and the Muddy Branch Stream Valley Park. The Muddy Branch Greenway Trail is a 9 mi long natural surface trail that runs from the Potomac River to Darnestown Road. along Muddy Branch. There is a boat ramp on Muddy Branch just before it goes under the C & O canal that can be used by small boats (such as canoes and kayaks) to access the Potomac River.