The varied terrain created many interface zones biologically nurturing a great many species. The mixed marshy terrain of the Conejohela Valley contained rapids and small waterfalls, wetlands, and thick woods along both sides of the river within a ten-year floodplain which saw annual inundations all the way down into Maryland at the headwaters of Chesapeake Bay, and experienced catastrophic floods regularly (the meaning of a ten-year floodplain). The creation of the lake shrank the upper Conejohela Flats in size. It created a long and relatively shallow lake, known as Lake Clarke, along the upper stretch of the Conejohela Valley. It is the most northerly and last of three Great Depression- era public electrification projects' hydroelectric dams, and was constructed between Apand December 7, 1931. The Safe Harbor Dam (also Safe Harbor Hydroelectric Station) is a concrete gravity dam, with an associated hydroelectric power station, on the lower Susquehanna River.
The east end of the turbine hall for the Safe Harbor Dam housing the 25 Hz turbines.
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