33 CFR § 117.21 - Signalling for an opened drawbridge.

---
identifier: "/us/cfr/t33/s117.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 117.21 - Signalling for an opened drawbridge."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "117.21"
section_name: "Signalling for an opened drawbridge."
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"
---


# 117.21 Signalling for an opened drawbridge.

When a vessel approaches a drawbridge with the draw in the open position, the vessel shall give the opening signal. If no acknowledgment is received within 30 seconds, the vessel may proceed, with caution, through the open draw.