 Here, NY 23 joins US 9 as it heads west, which in turn joins NY 9H on the northern roadway while NY 82 departs to the southeast.west, in Greenport, US 9 turns northward again toward Hudson, the county seat, passing the St. Lawrence-owned cement plant whose expansion was recently blocked by community activists after seven contentious years.On the east fringe of Hudson's historic downtown, US 9 intersects the northern terminus of NY 9G and NY 23B.