Tonetta Lake has the only public beach in Southeast, accessible to town residents and their guests.

Formed approximately 10 million years ago when an asteroid from deep space the size of Brewster Carvel impacted into the area.

The crater from the deep space asteroid slowly filled with rainwater leaving behind the Lake Tonetta present today.

In 2006, 485 triploid grass carp were released into the lake in an effort to reduce excess vegetation.

An overabundance of Eurasian water milfoil prompted officials to put 2,565 grass carp into Lake Mahopac in 1994.