(Northern Rail Trail #3) on Northern Rail Trail across Blackwater River W. of Andover, Andover Township, Merrimack County, NH. US4/NH11 W. 1.5 miles from jct with US4 on the E. side of Andover, S. on Bridge Rd. 0.1 miles through the covered bridge to the bridge to the E. (N43 26.089 W71 50.155) Photo by Paul Chandler 11-8-20.