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Alameda County Drawbridges
History and statistics of the six draw bridges that span the various waterways of the County.
Bascule Bridges
Operational data and links to commentary and photographs of a selection of moveable bridges.
Operation of Movable Bridges
Provide information on how Multnomah County in the United States operates four movable bridges; one vertical lift and three bascule, and the distinguishing features of each type.
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