The Hammonasset River is formed about 4 miles (6.4 km) southeast of Durham, Connecticut along a gully on the north end of Bunker Hill at about a half mile northeast of the junction of Route 148 and Bunker Hill Road.
The river travels for 21.0 miles (33.8 km)[1] to Clinton Harbor on Long Island Sound just east of Hammonasset Beach State Park.
A popular paddling route runs for about 10 miles (16 km) starting along Summer Hill Road about 2.5 miles (4.0 km) south on Route 79 from North Madison, Connecticut.
This is a scenic river run with mostly flat and quickwater, but with a few Class I-II whitewater areas.
The Hammonasset were a tribe of Algonquian Native Americans who had their "digging grounds" in this part of Connecticut, from the west bank of the Connecticut River to the Hammonasset River along the coast.