群馬大橋, Steel truss bridge in Maebashi, Japan

Gunma Bridge consists of two adjacent road bridges carrying National Route 17 across the Tone River between Otemachi 1-chome and Ishikura-machi in Maebashi. The downstream span, completed in 1953, is a four-span steel Warren through-truss bridge 280 m long with a 9.0 m roadway and two 2 m walkways; the upstream span, finished in 1997, is a four-span continuous steel box-girder bridge 280 m long and 15.5 m wide.

The first direction of traffic opened in 1953, with the second direction not completed until 1997. This long interval reflects how the region's transportation system evolved gradually over decades.

The name Gunma Bridge was chosen through a public contest open to residents of Gunma Prefecture. The first prize was 10,000 yen, and the contest drew 9,169 entries. The winning name was adopted for the 1953 bridge.

The bridge carries National Route 17 across the Tone River between Otemachi 1-chome and Ishikura-machi in Maebashi. The 1953 downstream span now handles only the outbound direction, while the 1997 upstream span carries inbound traffic; together they give five lanes. Walkways run along both structures.

The old 1953 span was chosen for the Kanto Region Bridge Hundred Selection by the NPO Civil Town Development Station, formerly IT Station Citizens and Construction. The name Gunma Bridge came from a public competition that drew 9,169 entries, with a first prize of 10,000 yen.