33 CFR § 401.41 - Tandem lockage.
---
identifier: "/us/cfr/t33/s401.41"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 401.41 - Tandem lockage."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "401.41"
section_name: "Tandem lockage."
chapter_name: "GREAT LAKES ST. LAWRENCE SEAWAY DEVELOPMENT CORPORATION, DEPARTMENT OF TRANSPORTATION"
part_number: "401"
part_name: "SEAWAY REGULATIONS AND RULES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
cfr_part: "401"
---
# 401.41 Tandem lockage.
Where two or more vessels are being locked together, vessels astern of the leading vessel shall:
(a) Come to a full stop a sufficient distance from the preceding vessel to avoid a collision; and
(b) Be moved into mooring position as directed by the officer in charge of the lock.