Saw Mill River

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The Saw Mill River is a 20 mile (32 km) long tributary of the Hudson River that flows from Chappaqua to Yonkers, where it empties into the Hudson. In the 17th Century, the Saw Mill River was known as Nepperhan Creek. In the 19th Century the lower portion was an important industrial area, with the New York and Putnam Railroad running along the river from Putnam County to central Yonkers, and thence to the Harlem River. Early in the 21st Century this "Old Putnam Railroad" became the South County and North County Trailways. The Saw Mill River Parkway parallels the river along its right bank, for much of its route through Westchester Country, and Sawmill River Road along the left.

The last 2,000 feet (610 m) of the river are buried in a flume passing under downtown Yonkers and its railroad station. Proposals to expose parts of the flume to daylight as part of the redevelopment of Yonkers are being considered.