New York State Route 9D is a scenic state highway located in the Hudson Valley region of New York. It runs approximately 20 miles, connecting the towns of Fishkill and Cold Spring. The route primarily follows the eastern bank of the Hudson River, offering picturesque views of the river and surrounding landscapes. Established in the 1930s, Route 9D serves as an important local roadway, providing access to various parks and recreational areas, including Bannerman Castle and Hudson Highlands State Park. The highway is popular among tourists and residents alike for its natural beauty and historical significance.