The northern terminus of NH 115A is at U.S. Route 2 in Jefferson at the Old Corner Store.

NH 115A intersects Whipple Road and Israel's River Road, designated New Hampshire Route 115B but sparsely signed as such, a continuation of the Turnpike Road, built by Colonel Whipple for access from the village of Riverton (Jefferson Mills) to Portland, Maine in the late 18th century.

The Portland-Montreal Pipe Line also crosses NH 115A, just below the old Waumbek site.

The pipeline right-of-way also serves as "Corridor 5" of the local snowmobile trail system.

The road passes the Forest Vale Cemetery, where lies the only victim of the Stanley Slide of 1885, which brought a large part of Cherry Mountain down upon the highway.