Cabin John Creek Watershed
The Cabin John Creek Watershed is located in southern Montgomery County, Maryland, just northwest of Washington, DC. The headwaters of Cabin John Creek originate in the City of Rockville. The creek flows south about 10 miles, passing under Interstate 270, through Cabin John Regional Park, under the Capital Beltway (I-495), and the historic Cabin John Bridge, to its confluence with the Potomac River near the towns of Cabin John and Glen Echo.
The major tributaries of the creek are:
Old Farm Branch
Thomas Branch (also called Beltway Branch)
The watershed is in Maryland's Piedmont Plateau geologic province, with an area of about 16,022 acres (25 square miles), and has been significantly affected by high-density residential and commercial development. There are parks, trails and natural areas throughout the watershed. In addition to the Regional Park, there are wooded park lands and buffer areas along several miles of the creek mainstem and tributaries. At least 30 species of fish have been identified in the Cabin John Creek mainstem and tributaries.
Zip code boundaries do not align with watershed boundaries, but the Cabin John Creek Watershed extends into:
20854 - Potomac
20852 - North Bethesda
20850 - Rockville
20818 - Cabin John
20812 - Glen Echo
20817 - Bethesda
20814 - Bethesda (small portion)