| Wallkill River | |
|---|---|
 Islands in the river near Walden, NY | |
 The combined watersheds of the Wallkill and Rondout Creek | |
| Native name | Twischsawkin |
| Location | |
| Country | United States |
| State | New York, New Jersey |
| Counties | Ulster, NY, Orange, NY, Sussex, NJ |
| Cities | New Paltz, NY, Walden, NY, Montgomery, NY, Sparta, NJ |
| Physical characteristics | |
| Source | Lake Mohawk, New Jersey |
| • location | Sparta, Sussex County, NJ |
| • coordinates | 41°01′58″N 74°38′38″W / 41.03278°N 74.64389°W |
| • elevation | 720 ft (220 m) |
| Mouth | Rondout Creek |
• location | Rifton, Ulster County, NY |
• coordinates | 41°51′13″N 74°02′55″W / 41.85361°N 74.04861°W |
• elevation | 0 ft (0 m) |
| Length | 88 mi (142 km)[1] |
| Basin size | 785 sq mi (2,030 km2)[2] |
| Discharge | |
| • location | Gardiner, NY[3] |
| • average | 1,365 cu ft/s (38.7 m3/s) |
| Basin features | |
| Tributaries | |
| • left | Shawangunk Kill |
| • right | Papakating Creek |
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)[1] to Rondout Creek in New York, just downstream of Sturgeon Pool, near Rosendale, with the combined flows reaching the Hudson at Kingston.
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.
- ^ a b U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-03-29 at the Wayback Machine, accessed October 3, 2011
- ^ Ulster County Soil and Water Conservation District, 2005, Draft Wallkill Watershed Conservation and Management Plan Archived 2007-07-15 at the Wayback Machine, 11, retrieved March 21, 2007.
- ^ United States Geological Survey; Wallkill River at Gardiner, NY; average annual discharge table. Figure given is for 2005. Retrieved March 14, 2007.