span

bridges

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In bridge
…the structure up, and the span between supports must be strong enough to carry the loads. Spans are generally made as short as possible; long spans are justified where good foundations are limited—for example, over estuaries with deep water.
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In bridge: U.S. designs
The main span at Dames Point is 390 metres (1,300 feet), with side spans of 200 metres (660 feet). From H-shaped towers of reinforced concrete, two planes of stays in harp formation support reinforced-concrete girders. The towers are carefully shaped to avoid a stiff appearance. The Dames…
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