Lake Macatawa is a lake in Ottawa County in the U.S. state of Michigan. The lake is about long with a maximum width of and a surface area of 1,700 acres (2.83 mi², 7.317 km²) The average depth of the lake is variable but generally less than , excluding a navigation channel of fixed depth that crosses the lake to allow deep draft ships to access the dock at the City of Holland. The lake occupies portions of Park Township, Holland Township, and the City of Holland. The lake contains two bays of significant size: Big Bay, and the smaller Pine Creek Bay to the east. The lake is the drowned river mouth of the Macatawa River (formerly known as the Black River), which feeds into the lake's eastern end in the City of Holland. Other tributaries include Pine Creek, which feeds into Pine Creek Bay, and Winstrom Creek, which feeds into Big Bay. The lake discharges into Lake Michigan at the U.S. Army Corps of Engineers channel near Holland State Park. The lake and its watershed encompass of Ottawa and Allegan counties.