NW-C-4723-26
CHS water level stations out of service between Montréal and Trois-Rivières
ActiveReceived 07 Nov 2026, 00:00 UTC
Warning text
Positions open on the mapNW-C-4723-26
Date
2026-11-07 13:26 UTC
Status
Published
Title
Scientific Instruments Change
Cancels
NW-C-4722-26
Areas
Montréal to Trois-Rivières
Categories
Presence of Scientific Equipment
Description
Canadian Hydrographic Service water level stations providing data used to calculate under keel clearance for the St. Lawrence River out of service.
Position
45° 47.287'N 073° 20.935'W
45° 56.548'N 073° 12.668'W
45° 37.806'N 073° 29.340'W
Charts
1310(NAD83),
1310(NAD83),
1311(NAD83)
Location map
Open on the full mapAnalysis
ActiveCanadian Hydrographic Service water level stations used to calculate under keel clearance on the St. Lawrence River are out of service. The outage affects locations between Montréal and Trois-Rivières at the three listed positions. Mariners should not rely on these stations for under-keel clearance calculations until service is restored. This notice cancels NW-C-4722-26.
Do not rely on the listed CHS water level stations for under-keel clearance; obtain alternative tide/level data and navigate with caution.
- Type
- Aids to navigation · severity moderate
- Feed
- Aids to navigationAll warnings of this kind on the map, or as an API feed.
- Location
- Montréal to Trois-Rivières
- Validity
- From 07 Nov 2026, 13:26 UTC
Date 2026-11-07 13:26 UTC - Hazards
- water level stations out of service, reduced availability of under keel clearance data
- Cancels
- NW-C-4722-26
- Charts
- 1310(NAD83), 1310(NAD83), 1311(NAD83)
Coast stations for this area
- RCCJRCC QuebecCanada108 NM from the area
- RCCJRCC TrentonCanada204 NM from the area
- RCCRCC BostonUnited States229 NM from the area
- DSCDSC Station Mont-St. BrunoJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM14 NM from the area
- DSCDSC Station MontrealJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM18 NM from the area
- DSCDSC Station SorelJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM19 NM from the area
- DSCDSC Station L’AcadieJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM28 NM from the area
- DSCDSC Station Mont RigaudJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM45 NM from the area
Worked out automatically from the warning text on 07 Nov 2026, 13:57 UTC. It can be wrong: the official warning text is the authority.