It starts at US 9 in Poughkeepsie and follows the Hudson River as it goes north . It crosses Route 9 just north of Rhinebeck and ends in Hudson . It runs north from U.S. Route 9 ( US 9 ) at Poughkeepsie , starting out as Violet Avenue , then follows the Hudson River mostly along the eastern side of the US 9 to Rhinebeck , where the two routes cross just north of the village .