石狩河口橋, Bridge at Ishikari River mouth in Hokkaido, Japan

The Ishikari River Mouth Bridge carries National Route 231 across the Ishikari River about 5 km from its mouth in Ishikari, Hokkaido. Its 1,412.7 m length combines a three-span continuous cable-stayed section of 288 m, with A-shaped pylons and two sets of cables in a fan arrangement, and five continuous composite-girder spans. The deck is 8.0 m wide for vehicles plus a 2.0 m walkway.

A bridge at the river mouth was long demanded, but the Ishikari is about 1,500 m wide there and the lower course rests on soft ground. Until then the Ishikari ferry carried traffic, becoming a state-run "moving national road" in 1955 and peaking at over 4,000 people and 1,500 vehicles a day. Construction began in 1967; a 664 m section opened in August 1972 and the full 1,412.7 m was completed in November 1976, after which the ferry closed on 31 March 1978.

Until 1978 the Ishikari ferry, nicknamed the "moving national highway", carried over 4,000 people and 1,500 vehicles a day at its peak; the bridge replaced it, and the ferry's role survives in local memory as the crossing that once linked the two banks.

The bridge carries National Route 231 about 5 km upstream from the Ishikari River mouth, with an 8.0 m roadway and a 2.0 m walkway. The crossing is exposed and open to the weather, so plan for wind on foot. The former Ishikari ferry crossing was abolished on 31 March 1978, so the bridge is now the route across.

The bridge replaced the Ishikari ferry, which was nicknamed the "moving national highway" and in its busiest year, 1971, carried over 4,000 people and 1,500 vehicles a day. The ferry was abolished on 31 March 1978, after the bridge took over the crossing.