Townline Lake is a 73-acre (300,000 m²) lake located in Mecosta County near the City of Big Rapids, Michigan. It is located in Colfax Township and Big Rapids Township. It has a maximum depth of 50 feet (15 m). Grass Lake (Private-approximately 6 acres) is located in the NW section of Townline Lake and has an outlet which feeds Townline Lake. The outlet from Townline feeds Enzo Creek, which ultimately feeds into Ryan Creek.