|Bonnie Brook, Merrimack River |
Halstead Avenue, Mamaroneck
|- location||White Plains, New York|
|Source confluence||Sheldrake River|
|Mouth||Long Island Sound|
|- location||Mamaroneck, New York|
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.
Two principal tributaries enter the Mamaroneck River, one from the east and one from the west. The East Branch of the Mamaroneck River is the furthest upstream tributary and originates in north Harrison near the intersection of Westchester Avenue and Anderson Hill Road. The West Branch originates just south of the Hutchinson River Parkway near Mamaroneck Avenue.
The East Branch of the Mamaroneck River is 3.3 miles long. The main stem is 1.9 miles long north of its confluence with the east branch. The east branch originates from a small pond in north Harrison at about 400 feet above sea level and then flows southeast 0.7 miles into Forest Lake. South of Forest Lake, it flows westerly to its confluence with the main stem.
The West Branch of the Mamaroneck River is the smallest of the Mamaroneck River's two primary tributaries, draining an area of 2.3 square miles just south and southeast of downtown White Plains. The west branch originates from a wetland and pond adjacent to Archbishop Stepinac High School on Mamaroneck Avenue and flows about 2.75 miles south and southwest through several stormwater management basins to its confluence with the main stem near the intersection of Mamaroneck Avenue and Hutchinson River Parkway.
- Lederer, Richard M. (1978). The Place-Names of Westchester County, New York. Harrison, New York: Harbor Hill Books. p. 78.
- "GNIS Detail - Mamaroneck River". U.S. Geological Survey. January 23, 1980. Retrieved December 26, 2011.
- Bode, Robert W. (2000). Biological stream assessment, Mamaroneck River, Westchester County, New York. New York: New York (State). Stream Biomonitoring Unit.