The Yantic River forms at the confluence of the Deep River, Sherman Brook, and Exeter Brook about 4 miles east of Colchester, Connecticut. It runs for 14.2 miles and flows into the Shetucket River in Norwich, forming the Thames River. The Yantic River is a popular whitewater paddling destination with a mix of quickwater and Class I-III whitewater. It pas…The Yantic River forms at the confluence of the Deep River, Sherman Brook, and Exeter Brook about 4 miles east of Colchester, Connecticut. It runs for 14.2 miles and flows into the Shetucket River in Norwich, forming the Thames River. The Yantic River is a popular whitewater paddling destination with a mix of quickwater and Class I-III whitewater. It passes through the towns of Lebanon, Bozrah, and Norwich. The USS Yantic was named after the river.