Roeliff Jansen Kill  The Roeliff Jansen Kill is a major tributary to the Hudson River. Roeliff Jansen Kill was the traditional boundary between the Native American Mahican and Wappinger tribes. Its source is in the town of Austerlitz, New York, and its mouth is at the Hudson River at Linlithgo in the town of Livingston. The stream flows for  through Dutchess and Columbia counties before entering the Hudson River about south of Hudson. Most of the watershed lies in Columbia County, although parts of the northern Dutchess County towns of North East, Stanford, Pine Plains, Milan, and Red Hook are within the stream's watershed of approximately . A major tributary is Shekomeko Creek. Both Roeliff Jansen Kill and Roeliff Jansen Park outside Hillsdale, NY were named after Roeliff Jansen. However, Roeloff Jansz was not an uncommon name. According to popular belief Roeloff Jansen (1602-1637) was born on the island of Marstrand in Bohuslän, Norway. In 1623, Jansen married Anneke Jans (1605-1663) who was from Flekkeroy, in Vest Agder, Norway. Following the birth of their first three children, they emigrated to New Netherland in 1630. The couple settled in first Rensselaerwyck near what is now Albany, New York, where Jansen had an engagement as a tenant farmer for Kiliaen Van Rensselaer. About 1634, he moved his family to New Amsterdam where he acquired a 62-acre farm on Manhattan Island, today in the Tribeca area of lower Manhattan. After his death, his widow married Domine Everardus Bogardus. Willem Frijhoff suggests it more likely refers to Roelof Jansz Haes , an alderman in Manor of Rensselaerswyck who was a trader in Beverwyck about 1634. By one account, he and some others were returning from New Amsterdam one winter when their boat became icebound for several days. They crossed the ice to shore and exploring the area, discovered the stream. They named it after the highest rankng member of the party, who was the alderman. This story is sometimes conflated with that of Roeliff Jansen of Marstrand. New York State Route 9G crosses the stream via the Roeliff Jansen Kill Bridge (also known as the Linlithgo Bridge), built in 1932.