Northstar Hydro prepared a hydrologic and hydraulic analyses for the planned breach/removal of the dam that impounded a lake originally built in the 1940’s as a water supply for an industrial mill in Pennsylvania. The lake owner proposed to remove the dam that impounds lake and restore the stream to a free-flowing natural state. Northstar analyzed the watershed hydrology using GIS tools and model HECHMS and studied dam removal affects using model HECRAS.