US Army Corps of Engineers
Pittsburgh District

DEAD SEA SAVIOR
From the 1940s through the early 1960s, the lake endured the toxic effects of acid drainage in its water shed from heavy coal and clay mining. During that time, the average pH levels in the outflow were between 4.0 and 5.0. This decline in water quality reduced the plankton, which is an essential aquatic organism and primary food chain element. At these levels, fish are not able to survive in this environment.