Piscataway Watershed encompasses approximately 67.6 square miles in southern Maryland just north and adjacent to the Mattawoman Watershed. The main stem of Piscataway Creek, centered in the watershed, flows approximately 20 miles from the upper creeks near Rosaryville, Woodyard and Joint Base Andrews west to Piscataway Bay - enframed by Mockley Point on the south and Fort Washington on the north and opening to the Potomac River below Washington, D.C. across from Mt. Vernon, Virgina. Other tribut...