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List of highest bridges in the world
This list of the world's highest bridges ranks bridges by deck height. The deck height of a bridge is the maximum vertical drop distance from the bridge deck (the road, rail or other transport bed of a bridge) down to the ground or water surface beneath the bridge span. Deck height should not be confused with structural height, which measures the maximum vertical distance from the uppermost point of a bridge (''e.g. top of the bridge tower'') down to the lowest visible point of a bridge, where its piers emerge from the surface of the ground, foundation or water. A separate list of the world's tallest bridges ranks bridges by structural height.
The rankings of the world's tallest and highest bridges differ in part because some of the highest bridges are built across deep valleys and gorges. The Sidu River Bridge in Hubei Province of China is a suspension bridge that spans a deep river gorge. The bridge's two towers, built on either rim of the gorge, are not tall enough for the bridge structure to be counted among the world's tallest, but due to the depth of the river gorge, the deck height of the Sidu River Bridge is at least above the river, making it the highest bridge in the world. The Millau Viaduct, a cable-stayed bridge that spans the Tarn River Valley in southern France, is a bridge that is both tall (in structural height) and high (in deck height). The viaduct's bridge deck soars above the valley floor, placing the bridge among the twenty highest bridges in the world. Unlike the Sidu River Bridge, the tallest of the Millau Viaduct's towers (also referred to as mast pylons) is situated near the valley floor and gives the Millau Viaduct a maximum structural height of , making it the tallest bridge in the world.
==Completed bridges==
The ranking of the highest bridges in the world, currently open for use. Only bridges with a height of or greater are included. Bridges under construction or demolished are not included.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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