US Army Corps of Engineers
New England District

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Mianus River Navigation Project

Mianus River

The Mianus River originates in southeastern New York, flowing southerly for about 20 miles before emptying into Cos Cob Harbor in Greenwich.

The earliest work on the Mianus River was completed in 1892. The present project, completed in 1951, is a 1.2-mile-long, six-foot-deep channel, 100 feet wide, extending from Cos Cob Harbor to U.S. Route 1 (Boston Post Road) in the Mianus section of Greenwich.