Great Loop Lock Reference

Welland Canal Lock 4

Reviewed planning reference for lock approach, communications, and float-plan preparation.

Welland Canal

Welland Canal Lock 4

Thorold, ON

Latitude / Longitude43.134983
-79.192133

Phone289-690-4344

VHF Channel14/15/17

Operating AuthorityNot listed

Last ReviewedNot listed

Lock Location

Zoomed-in location for this Great Loop lock reference.

About This Lock

Segment: Welland Canal. Route status: Great Lakes alternate when not using Trent-Severn/complete Erie route. Waterway Guide combines Locks 4-5-6 at same station; split here for one row per lock. Source: https://greatlakes-seaway.com/en/the-seaway/our-locks-and-channels/

Before You Arrive

Fenders ready
Lines ready
Crew briefed
PFDs on deck
Radio on correct channel
Call / monitor lock
Check current notices

Plan With FPW

Add lock planning context to your route and account for lock delays in your float plan.

Plan a Float Plan

Official Source

Official source

Open official source

Navigation Safety Note

This page is a planning reference, not a substitute for official notices, charts, lockmaster instructions, or current local conditions. Always confirm lock status, operating hours, closures, restrictions, and instructions with the official authority before arrival.