Baltimore County GovernmentThe watershed data set contains areas of land that contribute runoff and groundwater into a specific stream system. This data set shows the Baltimore County portion of the State-defined Maryland "8-digit" watersheds*. There are 14 major watersheds in Baltimore County. The data was interpreted from Baltimore County's 1953 topographic maps and was delineated at 1:2400 scale. *These features are not identical to the State-defined Maryland "8-digit" watersheds. The features were refined using 1953 topographic data and a larger delineation scale.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/ffa0ccbb55144cd38dca3ebecb80f8dd_2engBaltimore County Open Data PortalPublicWatersheds [Maryland--Baltimore County]Web servicesMaryland--Baltimore CountyMarylandLast Modified: 2025-11-12