Muddy Branch is a tributary stream of the Potomac River in Montgomery County, Maryland, located about 14mi northwest of Washington, D.C. The headwaters of the stream originate in Gaithersburg, and the stream flows southwest for, through Muddy Branch Park and Blockhouse Point Conservation Park, under the Chesapeake and Ohio Canal near Pennyfield Lock, to the Potomac River.Tributaries of Muddy BranchDecoverly TributaryLakes TributaryRoute 28 TributaryQuince Orchard Knolls TributaryDufief TributaryPotomac Grove TributaryQuery Mill TributaryPennyfield Lock Tributary
