Lake Thirteen is a private lake located in Surrey Township, Clare County, Michigan. The lake spans about 95 acres (38 ha), and reaches a maximum depth of about 32 feet (9.8 m). The lake serves recreational purposes such as watersports and fishing. In most fishing handbooks, the primary fish is listed as bullhead, but largemouth bass and northern pike can also be caught in the lake.
Lake 13 is an artificial lake, dug on the creekbed of Runyan Creek, which flows into the lake and is the primary water supply. The water depth varies, anywhere from 2 feet (0.6 m) in some areas, to a maximum of 30 feet (10 m). Some people believe the lake actually reached 40 feet (12 m) in depth, but muck and sand have filled in the holes.