C.F.R. » Title 23 » CHAPTER I—FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER G—ENGINEERING AND TRAFFIC OPERATIONS › PART 650—BRIDGES, STRUCTURES, AND HYDRAULICS › Subpart H—Navigational Clearances for Bridges

23 C.F.R. § 650.809

Movable span bridges

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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.