By the 1920s, a more radical solution was needed to deal with the water crisis. A new reservoir, known as Griffy Lake, was constructed in a more geologically suitable area north of the city. (It is now within Bloomington's official city limits.) Later, in the 1950s, two much larger reservoirs, Lake Lemon and Lake Monroe were created in the northeastern and southeastern parts of Monroe County. Monroe Lake was created by the US Army Corps of Engineers for flood control, but has since been used to supply the city and the county with water. The water pumping station at Griffy Lake has been mothballed.