construction of the PIP, US 9W used to follow a route through the State Line Lookout at the New Jersey–New York border which is now accessible only from the parkway. The entire route of US 9W in New Jersey is within Bergen County. New York Rockland County Across the state line, US 9W continues in Palisades as Highland Avenue, a two-lane road through mostly residential suburban surroundings. It passes Columbia University's Lamont–Doherty Earth Observatory and then Tallman Mountain State Park. Bending westward to Sparkill, it meets NY 340. It returns to the riverside at Piermont, where it takes the name Broadway Avenue. Running due north, it enters Nyack and meets with the New York State Thruway (I-87 and I-287) just west of the Tappan Zee Bridge. It then runs along the Thruway to the east terminus of NY 59 in downtown Nyack, where it becomes North Highland Avenue once again. North of Upper Nyack, it passes Rockland Lake thru Valley Cottage and then Rockland Lake State Park. Alongside the park, it crosses town lines again. NY 303 reaches its north end just after the park, and after a tight curve NY 304, reaches its northern terminus as well. US 9W then returns to the riverside briefly, trending away from it into Haverstraw under the name Congers Avenue. The village is followed immediately by West Haverstraw, where US 202 comes in at an oblique angle and joins US 9W, creating the first concurrency along the route. The combined highways head north from the Haverstraws as South, then North, Liberty Drive, passing Stony Point Battlefield. They return to the Hudson at Tomkins Cove, where the Hudson River National Defense Reserve (Mothball) Fleet was moored from 1947 to 1971. Between Tomkins Cove and Jones Point there are two large ships anchor surrounding a monument alongside the road that marks the spot which is just across from the Indian Point Energy Center in Buchanan. At Jones Point the road curves and bends above the river as it works its way around Dunderberg Mountain, the southernmost peak of the Hudson Highlands and part of Bear Mountain State Park. At Iona Island, it levels out again briefly and then US 9W/202 climbs to the heart of the state park at Bear Mountain Inn and Hessian Lake, where the Appalachian Trail crosses beneath the road in the only man-made tunnel along its entire route. The Orange County