Wallkill River

The Wallkill River, a tributary of the Hudson, drains Lake Mohawk in Sparta, New Jersey, flowing from there generally northeasterly 88.3 miles (142.1 km) to Rondout Creek in New York, just downstream of Sturgeon Pool, near Rosendale, with the combined flows reaching the Hudson at Kingston.

Wallkill River
Islands in the river near Walden, NY
The combined watersheds of the Wallkill and Rondout Creek
Native nameTwischsawkin
Location
CountryUnited States
StateNew York, New Jersey
CountiesUlster, NY, Orange, NY, Sussex, NJ
CitiesNew Paltz, NY, Walden, NY, Montgomery, NY, Sparta, NJ
Physical characteristics
SourceLake Mohawk, New Jersey
  locationSparta, Sussex County, NJ
  coordinates41°01′58″N 74°38′38″W
  elevation720 ft (220 m)
MouthRondout Creek
  location
Rifton, Ulster County, NY
  coordinates
41°51′13″N 74°02′55″W
  elevation
0 ft (0 m)
Length88 mi (142 km)
Basin size785 sq mi (2,030 km2)
Discharge 
  locationGardiner, NY
  average1,365 cu ft/s (38.7 m3/s)
Basin features
Tributaries 
  leftShawangunk Kill
  rightPapakating Creek

The river is unusual because it flows north between two major south-flowing rivers, the Hudson and the Delaware River. It also has the unusual distinction of being a river that drains into a creek, due to being impounded shortly before the Rondout confluence into a small body of water called Sturgeon Pool near Rifton, and what reaches the Rondout from there is the lesser flow.

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