Clear Lake is the name of a natural spring fed body of water located in Cerro Gordo County, Iowa near Clear Lake, Iowa. It is approximately 3,684 acres (15 km²) in size. It is a popular fishing destination, with walleye, bullhead, yellow bass and channel catfish. People from Des Moines and Minneapolis–Saint Paul have had homes on the shores of the lake since the 1870s. The average depth is 10 feet (3 m) and the maximum depth is 30 feet (9 m), in the dredged area of the west end. The lake has 13.6 mi (22 km) of shoreline. As of 2004, the lake has seen major efforts undergone to restore its natural clarity, including filtration systems, dredging, and education of local farmers to reduce toxic pesticides from entering the lake.