West Branch Mamaroneck River

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West Branch Mamaroneck River flows into Mamaroneck River , which it joins at N 40° 58′ 56″, W 73° 44′ 40″ at OSM node n11752106882, and there 21 km of total upstream flows in. load it's distributaries

West Branch Mamaroneck River has 1 tributaries.

• (unnamed), which joins it at N 40° 59′ 47″, W 73° 45′ 33″ at OSM node n11752118471, and 215 m of total upstream flows in.
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