Use this interactive map to explore sub-watersheds of the Potomac River basin. Click on a watershed to view more information.

The Potomac River Basin covers about 14,670 square miles through Virginia, Maryland, West Virginia, Pennsylvania, and the District of Columbia. This Story Map is a collection of stories pulled from the weekly ICPRB publication, About the Basin.

Map of unreported water use in the Potomac River basin.

The Potomac basin is the 2nd largest watershed in the Chesapeake Bay.

Chessie BIBI (family-level version of the bioregion index) ratings for streams and small rivers in the Chesapeake Bay watershed. When sufficient data (n > 3 catchments) are available, HUC12 watersheds are colored per the rating of their average index score. Otherwise, individual sampling locations are indicated and colored per their ratings.

ICPRB has map sets for the upper Potomac River and its surrounding trails. These maps are a terrific way to get to know the Potomac from Shepherdstown, W.Va., to Potomac Park, Md. Recreational fishing, biking, hiking, kayaking, canoeing, camping, parking, and public boat launch information is included. For the history buffs, there is information about parks and historical sites to satisfy your curiosity.

The maps are printed in color on a tear-proof, waterproof polyester material. Copies are $5 for the set, including postage. To order, please send $5 for each map set to: ICPRB-Maps, 30 West Gude Dr., Suite 450, Rockville, MD 20850.

This set of maps, produced by ICPRB with the help of many government agencies and non-profit groups, has been out of print for several years. However, the maps have been updated and digitized and can be downloaded for free. The 10 maps cover the river and C&O Canal National Historic Park from Washington, D.C., to Opequon Creek, a short distance upstream of Shepherdstown, W. Va.

This downloadable JPG map features the sub-watersheds of the Potomac River basin.

This downloadable JPG map features the major streams and rivers of the Potomac Watershed.

Find stewardship opportunities through local watershed groups.

Find your representative with our Congressional Districts Map.

Areas served by Fairfax Water, Rockville, Washington Aqueduct, and WSSC and water supply reservoirs.

Download PDFs for the following watersheds:
Potomac and Chesapeake Bay
Monocacy River and Catoctin Creek
Conococheague Creek
Conococheague Creek, Antietam Creek and Licking Creek
Sideling Hill Creek
Town Creek
Fifteenmile Creek