U.S. Route 3 - Termini

Termini

According to the AASHTO route log, the southern terminus of US 3 is at US 20 in Boston, after crossing the Charles River at the Boston University Bridge. However, MassDOT officially places the southern terminus at the junction of Route 2A and Route 3 in Cambridge, which is where Route 2A crosses the Charles along the Harvard Bridge (also known as the Massachusetts Avenue Bridge). The original northern terminus (in 1926) was Colebrook, New Hampshire, but the highway was extended to West Stewartstown, New Hampshire in 1928, and to Pittsburg, New Hampshire in 1937. Colebrook was temporarily the northern terminus again from 1939 to 1940. Since 1940, the highway has run through Pittsburg to the New Hampshire-Quebec border.