Cross Lake is a lake on the border of Cayuga and Onondaga Counties in New York, United States. The lake lies within the boundaries of the traditional Onondaga Indian Nation, and is reputed in local tradition to be the boyhood home of Hiawatha, the great peace maker. However, Onondaga Lake is also said to be Hiawatha's home.
Cross Lake has a maximum depth of 65 feet and has an average depth of 18 feet. The Seneca River flows west to east through the south end of the lake. Since Cross Lake is part of the New York State Canal System, there are a variety of fish that pass through it. Cross Lake has a flushing rate of 51 times per year; once per week.