The Lackawanna River begins in the southeast corner of Susquehanna County, where its east and west branches flow into Stillwater Reservoir, just south of Union Dale and about 4 miles north of Forest City. The lower 40 miles of river running through Lackawanna County. A wild brown trout mecca. The Lackawanna contains more fish-filled public water than almost any river in Pennsylvania. The 37 miles of river below Stillwater Dam contain significant populations of mostly wild, naturally reproducing brown trout, with little to no private water. Nearly 18 of those miles are designated by the Pennsylvania Fish & Boat Commission (PFBC) as either Class A or Trophy Trout water.