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Byram River
Mill Bridge PC jeh.JPG
The harbor
Country United States
State Connecticut, New York
County Westchester County, Fairfield County
Physical characteristics
Main source Byram Lake
North Castle, New York
750 feet (230 m)
41°09′19″N 73°41′33″W / 41.1554°N 73.6925°W / 41.1554; -73.6925
River mouth Port Chester Harbor
Port Chester, New York, Greenwich, Connecticut
0 feet (0 m)
40°59′18″N 73°39′37″W / 40.9884°N 73.6604°W / 40.9884; -73.6604
Length 13.9 miles (22.4 km)
Basin features
Basin size 29 square miles (75 km2)
Byram Bridge, Port Chester, Ny
In 1906

The Byram River is a river approximately 13.9 miles (22.4 km) in length, in southeast New York and southwestern Connecticut in the United States.

The river has an elevation of 750 feet (230 m) at its headwaters at Byram Lake in Westchester County, New York, and flows in a southward direction, crossing the New York-Connecticut border and eventually reaching sea level at Port Chester Harbor, where it empties into the Long Island Sound. The lower portion of the river is paralleled by the Merritt Parkway in Connecticut and eventually forms the southernmost portion of the New York-Connecticut border.

The river has a 29-square-mile (75 km2) drainage basin.

There are several dams on the river which are controlled by the Town of Greenwich.

Several bridges cross the river. As of the summer of 2007, three of the bridges in northwest Greenwich had been identified by state inspectors as in critical need of repair, and all were scheduled for work:

  • Bailiwick Road — already in poor shape, the bridge was further damaged by the nor'easter of April 15, 2007. In May emergency repairs were made. A redesign of the bridge may be needed to better protect against future flooding, town officials said.
  • Riversville Road — Greenwich officials imposed weight restrictions on the bridge which were in effect in the summer of 2007. Dump trucks are prohibited from using it, but 10-ton box trucks and 15-ton semis are allowed.
  • Sherwood Avenue — Greenwich officials imposed weight restrictions on the bridge which were in effect in the summer of 2007. Only 15-ton box trucks and 26-ton semis are allowed.


The Byram River was once a center of economic activity where shipbuilding and fishing were major industries. The Byram section of Greenwich is at the southern end of the river, on the Connecticut side.

On April 15, 2007, a nor'easter flooded areas near the river on both the Connecticut and New York sides. In July 2007, Greenwich town officials gave initial approval for spending $250,000 to study drainage improvement in flood-prone areas near the river, including the idea of dredging the river.

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