The Susquehanna River watershed comprises 43% of the Chesapeake Bay watershed. The West Branch Susquehanna (the principal tributary of the Susquehanna River) is 243 miles long, and drains approximately 7,000 square miles of Pennsylvania. The river originates near Elmora, PA, and joins with the Middle Susquehanna near Selinsgrove, PA. The West Branch Susquehanna is considered the most impaired of the four Susquehanna sub-basins, and one of the most polluted basins in America. Pollution from acid mine drainage accounts for the majority (60%) of the pollution in the basin. (Based on Susquehanna River Basin Commission, Trout Unlimited, and West Branch Susquehanna Restoration Coalition.)
