lifting span

noun

noun

A span of a bridge that can be raised to allow boats and ships through; these can have different forms.

The vertical lifting span is raised on four reinforced concrete piers which are some 130 ft. high. […] The lifting span, which rises vertically between the towers, weighs 465 tons and is counterweighted by four 110-ton weights.1960 June 23, “New Lifting Bridge at Kings Ferry”, in Railway Magazine, page 388:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.