33 CFR § 117.17 - Signalling for contiguous drawbridges.

---
identifier: "/us/cfr/t33/s117.17"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 117.17 - Signalling for contiguous drawbridges."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "117.17"
section_name: "Signalling for contiguous drawbridges."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "J"
subchapter_name: "BRIDGES"
part_number: "117"
part_name: "DRAWBRIDGE OPERATION REGULATIONS"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 499; 33 CFR 1.05-1; and DHS Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "CGD 82-025, 49 FR 17452, Apr. 24, 1984, unless otherwise noted."
cfr_part: "117"
---


# 117.17 Signalling for contiguous drawbridges.

When a vessel must past two or more drawbridges close together, the opening signal is given for the first bridge. After acknowledgment from the first bridge that it will promptly open, the opening signal is given for the second bridge, and so on until all bridges that the vessel must pass have been given the opening signal and have acknowledged that they will open promptly.