The official causeway site lists the clearance of the bascule at 45 feet .

介绍该长堤的官方网站列出了吊桥的净高为45英尺。

The red arrow shows the location of the camera and the other yellow pin is the bascule .

红色箭头表示照相机的位置，另一个黄色定位销表示吊桥。

Use shadows from google earth images to find the ratio of the normal roadway height to the height of the bascule .

使用谷歌地球的投影图求得长堤路面高度与吊桥高度之比。

Also , you can see the bascule ( draw bridge ) sticks out even more and is farther away .

此外，你会看到，开合桥（吊桥）显得更高，离你更远。

So , maybe the top rail of the bascule at that point is perhaps 50 55 feet above the water ( not counting the towers and stuff which are difficult to see ) .

因此，此时吊桥的顶轨在水面上的高度可能为50－55英尺（不计桥塔和很难看到的部位）。