The Calhoun Street Extension is a series of roads in Trenton, New Jersey and nearby Lawrence, New Jersey. It runs from the Calhoun Street Bridge over the Delaware River to Brunswick Circle, and is composed of the following named streets:

• Calhoun Street
• Princeton Avenue
• Brunswick Circle Extension

The Extension was built as a joint undertaking by the New Jersey State Highway Commission, Trenton and Mercer County; it opened in January 1932. New roads built were the Brunswick Circle Extension and the northeast part of Calhoun Street; the rest of Calhoun Street and Princeton Avenue existed before the road was built.

The road was intended as a bypass of downtown Trenton for cars and light trucks; the Calhoun Street Bridge had and still has a low weight limit. It may have been part of Route 26, which continued north from Brunswick Circle. On the Pennsylvania side of the Delaware River, the road from the bridge rejoined the Lincoln Highway to Philadelphia at Fallsington. On the New Jersey side, the Lincoln Highway ran through Brunswick Circle, and the new Route 26 bypass to New Brunswick, built in 1930, began at the Circle.

The Extension now has the following numbers:

• CR 653 along Calhoun Street
• CR 583 and southbound US 206 (also signed as southbound BUS US 1) along Princeton Avenue
• CR 645 (also signed as southbound US 206 and BUS US 1; US 206 southbound officially stays with Princeton Avenue and BUS US 1 southbound isn't officially there) along Brunswick Circle Extension

Sources

• New By_Pass in Trenton, New York Times January 31, 1932 page XX8