The Calhoun Street Toll Supported Bridge (also known as the Trenton City Bridge) is a historic bridge connecting Calhoun Street in Trenton, New Jersey across the Delaware River to East Trenton Avenue in Morrisville, Bucks County, Pennsylvania, United States. It was constructed by the Phoenix Bridge Company of Phoenixville, Pennsylvania, in 1884, replacing an earlier bridge built in 1861. The bridge was part of the Lincoln Highway until 1920 (when the highway was moved to the free Lower Trenton Bridge), and was later connected to Brunswick Circle by the Calhoun Street Extension as part of a bypass of downtown Trenton. Before 1940, trolleys of the Trenton-Princeton Traction Company, utilized this bridge to cross into Pennsylvania. The bridge is owned by the Delaware River Joint Toll Bridge Commission, and is maintained with tolls from other bridges. It carries Light vehicle traffic, and streetcars until 1940.

On May 24, 2010, the bridge completely closed to vehicular and pedestrian traffic to undergo much-needed renovations including truss repair and repainting, deck replacement, and repair of approaches. The rehabilitation project was completed October 8, 2010, and the bridge was rededicated in a ceremony on October 12.

The bridge helps connect segments of the East Coast Greenway, a 3,000-mile-long (4,800 km) trail system connecting Maine to Florida.

Currently, the bridge is limited to 3 short tons (2.7 t) at 15 miles per hour (24 km/h) with a clearance of 8 feet (2.4 m).

• List of crossings of the Delaware River
• National Register of Historic Places listings in Mercer County, New Jersey

• Media related to Calhoun Street Bridge at Wikimedia Commons
• Calhoun Street Bridge at Structurae
• Bridge Maker's Signs or Plates - Calhoun Street Bridge
• Historic American Engineering Record (HAER) No. PA-592, "Lincoln Highway, Running from Philadelphia to Pittsburgh, Fallsington, Bucks County, PA", 81 photos, 3 color transparencies, 49 data pages, 9 photo caption pages, includes the Calhoun Street Bridge