The Ottauquechee River (pronounced AWT-ah-KWEE-chee) is a 41.4-mile-long (66.6 km) river in eastern Vermont in the United States. It is a tributary of the Connecticut River, which flows to Long Island Sound. A headwaters tributary known as the North Branch Ottauquechee River flows southeastwardly through the towns of Killington and Bridgewater. Quechee State Park is located along the river near the village of Quechee. Near the river's mouth the U.S. Army Corps of Engineers' North Hartland Dam impounds the river to form North Hartland Lake.