The Ompompanoosuc River // is a river, about 25 mi (40 km) long, in eastern Vermont in the United States. It is a tributary of the Connecticut River, which flows to Long Island Sound. According to the Geographic Names Information System, the river has also been known by the names "Om-pom-pa-noos-uc" and "Pompanoosuc."
The Ompompanoosuc River rises in eastern Orange County in the town of Vershire, and flows generally southwardly through the towns of West Fairlee and Thetford into northeastern Windsor County, where it joins the Connecticut River in the town of Norwich.
In Thetford the river is dammed by the Union Village Dam, which was completed in 1950 as part of a U.S. Army Corps of Engineers project for flood control. The structure is a 170-foot-high earthen dam, creating a seasonal lake in the winter.
- Columbia Gazetteer of North America entry
- U.S. Geological Survey Geographic Names Information System: Ompompanoosuc River
- DeLorme (1996). Vermont Atlas & Gazetteer. Yarmouth, Maine: DeLorme. ISBN 0-89933-016-9
- Union Village Dam website from the U.S. Army Corps of Engineers
- U.S. Geological Survey Geographic Names Information System: West Branch Ompompanoosuc River
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