Tearing down dams may help fish move more freely, but construction can slow down the barges and boats that carry nearly 80 percent of the freight in the U.S. When it came time to replace the l920s-era Olmsted Locks and Dam on the Ohio River, the country's busiest inland passage, the Army Corps of Engineers got creative. Rather than draining the waterway to build on the riverbed, as usual, engineers are constructing the new dam's 36 sections on land and then moving them into place. The Corps built the largest super gantry crane in the world (140 feet high and 160 feet wide) to lift the dam sections (some up to 3,700 tons) onto a barge and is piecing them together in the water. Transporting each section takes about three weeks. At that pace, the dam could be complete by 2016.
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机译：拆除大坝可以帮助鱼类更自由地移动，但是建造可以减慢在美国运送近80％货物的驳船和船只的速度。当需要在俄亥俄州河上替换l920年代的Olmsted Locks and Dam时，该国最繁忙的内陆通道，陆军工程兵团富有创造力。工程师们并没有像往常一样排干河道，而是在陆地上建造新大坝的36个断面，然后将它们移动到位。兵团建造了世界上最大的超级龙门起重机（高140英尺，宽160英尺），将大坝部分（部分重达3700吨）提升到驳船上，并将它们在水中拼凑在一起。运输每个部分大约需要三个星期。以这种速度，大坝可能在2016年完工。
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