MD iMAP: Maryland Waterbodies - Rivers and Streams (Generalized)
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The digital segmented network based on watershed boundaries -  ERF1-2 -  includes enhancements to the U.S. Environmental Protection Agency's River Reach File 1 (RF1) (USEPA -  1996; DeWald and others -  1985) to support national …