Big Six Mile Creek Marina is a 21acre state park and marina located on the upper Niagara River on Grand Island in Erie County, New York.Park descriptionBig Six Mile Creek Marina is located in a protected valley along a tributary to the Niagara River, and features the only public boat launch facilities on the western side of Grand Island.The park offers a marina with 134 seasonal boat slips, as well as a boat launch ramp and fishing access. The park is open from May through November.The park's facilities and docks, initially constructed in the 1950s, were improved and reconstructed in 2013.