CFR > Title 23 - Highways > CHAPTER I—FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION > SUBCHAPTER G—ENGINEERING AND TRAFFIC OPERATIONS (parts 620 to 669) > PART 650—BRIDGES, STRUCTURES, AND HYDRAULICS > SUBPART H—Navigational Clearances for Bridges (§650.801 to §650.809) > 650.809—Movable span bridges.

650.809—Movable span bridges.

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.