Feb 8, 2024
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Kawazu Nanadaru, the Crazy Loop Bridge in Japan

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Kawazu Nanadaru Loop Bridge is a marvel of engineering nestled in the scenic landscapes of Shizuoka Prefecture, Japan. Located just 53 kilometers from the Nagaisen Numazu Interchange of the New Tomei Expressway, reaching the Kawazu Nanadaru Loop Bridge is a breeze. Travelers can access it via the Izu Jukan Expressway, Izu Chuo Expressway, Shuzenji Road, National Route 136, and finally, National Route 414. Plus, the central space of the loop serves as a convenient municipal parking lot.

NameKawazu Nanataki Loop Bridge
LocationKawazu, Shizuoka Prefecture, Japan
Length3491 feet (1064 meters)
Height difference147 feet (45 meters)
Diameter262 feet (80 meters)

The Looping Wonder

Officially known as the Nanadaru Viaduct, this architectural gem boasts a double-loop design, stretching over 1064 meters with a breathtaking height difference of 45 meters. Crafted by the skilled hands of the Japan Structural Bridge Research Institute, this bridge stands as a testament to human ingenuity and innovation.

Picture this: you’re driving from Shimoda City, ascending counterclockwise, or perhaps you’re descending clockwise from Izu City and Tenjo Tunnel. Either way, get ready for the thrill of a 720-degree, 2-rotation loop! As you traverse the bridge, marvel at its unique structure supported by six sturdy piers, creating a seamless flow through its 3-span continuous curved box girder.

Fun Facts and Safety Measures

While the Kawazu Nanadaru Loop Bridge offers an adrenaline-packed experience, safety is paramount. With a single-lane setup for two-way traffic, the speed limit is set at 40 kilometers per hour (km/h), ensuring a secure journey for all travelers. Remember, overtaking is prohibited to maintain safety standards and prevent accidents.

A Glimpse into History

Delve into the rich history behind this iconic bridge. Originally, the area was traversed by the Route 13 Shuzenji Shimoda Line, which wound its way along the mountainous terrain. However, the 1978 Izu-Oshima earthquake reshaped the landscape, prompting the construction of the loop bridge in 1981. Recognized for its excellence, the bridge received the prestigious Tanaka Award from the Japan Society of Civil Engineers.

Conclusion: An Unforgettable Adventure

Prepare to be captivated by the sheer magnificence of Kawazu Nanadaru Loop Bridge. Whether you’re a thrill-seeker, a nature enthusiast, or a history buff, this iconic landmark offers an unforgettable experience for all. So, buckle up, embrace the excitement, and embark on a journey you’ll cherish forever!


In the past, the main local road, the Shuzenji-Shimoda Line, was twisted along the mountain, but it collapsed due to the 1978 earthquake near Izu Oshima, and the road on the mountainside was cut off.

Later, the loop bridge was created in 1981 by improving the convenience of traffic and resolving the difference in height, and by adopting a construction method that took advantage of the lessons learned from landslides caused by earthquakes . In the same year, he received the Tanaka Award from the Japan Society of Civil Engineers . Major local road No. 13 Shuzenji-Shimoda Line was upgraded to National Route 414 in April 1982 due to the general national highway revision in April 1981 .

Kawazu Nanadaru Map

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Asia · Japan

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