46 C.F.R. § 42.25-10 Construction of vessel.
Title 46 - Shipping
(a) Superstructure. (1) Vessels, shall have a forecastle of at least standard height and a length of at least 0.07L. In addition, if the vessel is less than 328 feet in length, a poop of at least standard height, or a raised quarter deck with either a deckhouse or a strong steel hood of at least the same total height shall be fitted aft. (b) Double bottom tanks. (1) Double bottom tanks where fitted within the midship half length of the vessel shall have adequate watertight longitudinal subdivision. (c) Bulwarks. (1) The vessel shall be fitted either with permanent bulwarks at least 39 [CGFR 68–60, 33 FR 10067, July 12, 1968, as amended by CGFR 68–126, 34 FR 9016, June 5, 1969]
Title 46: Shipping
PART 42—DOMESTIC AND FOREIGN VOYAGES BY SEA
Subpart 42.25—Special Requirements for Vessels Assigned Timber Freeboards
§ 42.25-10 Construction of vessel.