23 C.F.R. § 650.809 Movable span bridges.
Title 23 - Highways
A fixed bridge shall be selected wherever practicable. If there are social, economic, environmental or engineering reasons which favor the selection of a movable bridge, a cost benefit analysis to support the need for the movable bridge shall he prepared as a part of the preliminary plans.
Title 23: Highways
PART 650—BRIDGES, STRUCTURES, AND HYDRAULICS
Subpart H—Navigational Clearances for Bridges
§ 650.809 Movable span bridges.
