Monroe Lake is a reservoir located about 10 miles (16 km) southeast of Bloomington, Indiana, United States. The lake is the largest entirely situated in Indiana with 10,750 acres (43.5 km2) of water surface area spread over the counties of Monroe and Brown. Capacity varies from 292 gigalitres (237,000 acre⋅ft) to 428 gigalitres (347,000 acre⋅ft) depending on water level. It is also home to 13,202 acres (53.43 km2) of protected forest and three recreational areas. Indiana's only federally protected U.S. Wilderness Area, the 13,000-acre (53 km2) Charles C. Deam Wilderness Area, is located on the south shore. The lake's watershed is 441 square miles, 82% of which is forested or farmland. The pool elevation is about 538 feet (164 m) year-round. During colder winters, limited ice fishing is available on protected backwater portions of the reservoir.