Mamaroneck River
| Mamaroneck River | |
| Bonnie Brook, Merrimack River | |
| Stream | |
 Halstead Avenue, Mamaroneck
|
|
| Country | United States |
|---|---|
| State | New York |
| District | Westchester County |
| Source | |
| - location | White Plains, New York |
| - coordinates | 41°02′34″N 73°45′08″W / 41.04288°N 73.75236°W |
| Source confluence | Sheldrake River |
| - coordinates | 40°57′18″N 73°44′12″W / 40.954914°N 73.736621°W |
| Mouth | Long Island Sound |
| - location | Mamaroneck, New York |
| - coordinates | 40°56′23″N 73°43′15″W / 40.9398209°N 73.7209638°WCoordinates: 40°56′23″N 73°43′15″W / 40.9398209°N 73.7209638°W |
The Mamaroneck River is a freshwater stream located in Southern Westchester County, New York. The river forms in White Plains and Harrison and flows 7.3 miles (11.7 km) south through Mamaroneck Town and Village, where it empties into Mamaroneck Harbor and Long Island Sound.
The watershed of the Mamaroneck River is 17.4 square miles. It is dominated by suburban residential neighborhoods and commercial and retail tracts. High density residential development also is prevalent throughout the middle and lower portions of the watershed.
Originating 430 feet above sea level in a small wetlands area in Harrison, the river flows south along the eastern boundary of White Plains. It joins the 'East Branch' near the junction of Anderson Hill Road and Westchester Avenue. The Mamaroneck River flows another 2.5 miles to its confluence with the 'West Branch', where it forms the river's main stem. Human encroachment into the stream corridor and manipulation of the stream channel are byproducts of intense residential construction in and around the river's headwaters.
The main stem of the Mamaroneck River flows southeasterly, paralleling Westchester Avenue and the Hutchinson River Parkway. Below the parkway, the river flows south to its confluence with the West Branch of the Mamaroneck River at the Mamaroneck Reservoir. South of the reservoir, the river forms the municipal boundary between Mamaroneck Village and Harrison. At the New England Thruway, the Mamaroneck River flows southward through Mamaroneck Village, where it joins the Sheldrake River and finally emptying into Mamaroneck Harbor on Long Island Sound.
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Wikipedia