Lake Columbia is a small man-made lake in Columbia Township in southern Jackson County in the U.S. state of Michigan. Originally formed as a mill pond in 1836, it was expanded to 840 acres (3.4 km²) in 1961. At its greatest extent, the lake is 2 and 1/4 miles long and 1 and 3/4 miles wide. It has approximately 14 miles (23 km) of shoreline and the water source to the lake is Goose Creek. The lake has an average depth of 18 feet (5.5 m). Lake Columbia is located 2 miles (3.2 km) west of Brooklyn, Michigan.