Kawazu-Nanadaru Loop Bridge, Spiral bridge in Kawazu, Japan
The Kawazu-Nanadaru Loop Bridge forms two complete circles along National Route 414, with a diameter of 80 meters and total length of 1064 meters.
The bridge construction in 1981 followed the 1978 Izu-Oshima earthquake, which caused landslides and disrupted the previous mountain road infrastructure.
The structure received the Japan Society of Civil Engineers Tanaka Prize for its engineering solutions in navigating the mountainous Amagi terrain.
The parking area beneath the bridge accommodates 25 regular vehicles, with access from Numazu Interchange requiring approximately 75 minutes by car.
The bridge design incorporates two full spiral loops to manage a 45-meter elevation change while maintaining safe vehicle passage through the mountains.
Location: Kawazu
Inception: 1981
Architects: 日本構造橋梁研究所
Length: 1,064 m
GPS coordinates: 34.79272,138.93690
Latest update: May 11, 2025 07:22
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