Appendix I to Subpart A of Part 401 - Vessel Dimensions
33:3.0.2.1.2.1.22.99.27 : Appendix I
Appendix I to Subpart A of Part 401 - Vessel Dimensions
Structures are located at a number of Seaway locks which, when
fully raised, overhang the lock wall at a given point, thereby
limiting:
(a) The height of a vessel above the water line measured at the
vessel's side; and
(b) The height of other structures that are located near the
sides of the vessel, such as derricks, crosstrees, antennas,
etc.
The following block diagram shows the limits beyond which a
vessel's hull or superstructure cannot extend when the vessel is
alongside the lock wall.
The limits in the block diagram are based on vessels with a
maximum allowable beam of 23.2 m. For vessels that have a beam
width less than this and that have dimensions exceeding the limits
of the block diagram (measured with the vessel alongside the lock
wall), a special permission to transit must be obtained. (Accurate
measurements may be required before such permission is
granted).
Caution: Masters must take into account the ballast draft
of the vessel when verifying the maximum permissible dimensions.
Bridge wings, antennas, masts and, in some cases, the samson posts
or store cranes could be outside the limits of the block diagram
and could override the lock wall. Masters and pilots must take this
into consideration and exercise extreme caution when entering or
exiting locks to ensure that the vessel does not contact any of the
structures on the lock.
(68 Stat.
93-96, 33 U.S.C. 981-990, as amended and secs. 4, 5, 6, 7, 8, 12
and 13 of sec. 2 of Pub. L. 95-474, 92 Stat. 1471) [45 FR 52381,
Aug. 7, 1980, as amended at 49 FR 30936, Aug. 2, 1984; 61 FR 19552,
May 2, 1996; 81 FR 13747, Mar. 15, 2016]