Minato Bridge

The Minato Bridge is a double-deck cantilever truss bridge in Osaka, Japan; upper deck is for Hanshin Expressway Route 16 Osakako Line, and lower deck is Route 5 Bayshore Line. It opened in 1974. It is the third-longest cantilever truss span in the world, behind the Quebec Bridge and the Forth Bridge.[2]

Minato Bridge 港大橋
Coordinates	34.644069°N 135.437629°E / 34.644069; 135.437629 (Minato Bridge)
Carries	vehicular traffic
Locale	Osaka, Japan
Maintained by	Hanshin Expressway Company, Limited
Characteristics
Design	double-deck cantilever truss bridge[1]
Material	High-strength steel[2]
Total length	983 metres (3,225 ft)[1]
Width	22.5 metres (74 ft) (deck)[1]
Longest span	1 × 510 metres (1,670 ft) 2 × 235 metres (771 ft)[2]
Clearance below	51 metres (167 ft)[2]
History
Construction end	1973[1]
Construction cost	US$117 million[3]
Opened	1974[1][2]
Location

Designs including arch and suspension elements were eliminated from consideration due to poor subsoil conditions of alternating layers of clay and gravel. Instead, the designers selected a cantilever structure using high-strength steel, to reduce mass.[2]