NW-C-4431-26
PAN PANReceived: 21 Oct 2026, 00:00Updated: 1 Nov 2026, 12:53
analysis
ActiveNewly discovered shoal between Montréal and Trois-Rivières
A shoal has been discovered and confirmed in the St. Lawrence River between Montréal and Trois-Rivières. The feature is bounded by four positions with centroid at 46° 10.602'N 072° 55.134'W. Reported least depth is 10.5 metres. This notice cancels NW-C-4072-26.
Navigate with caution and consult updated charts; avoid the shoal area.
- Type
- Wreck / obstruction · severity moderate
- Feed
- Wrecks, obstructions and drifting objectsAll warnings of this kind on the map (contributors), or as an API feed: /api/v2/feeds/hazards/
- Location
- Montréal to Trois-Rivières
- Validity
- From 21 Oct 2026, 18:03 UTC
Date 2026-10-21 18:03 UTC. In Force Shoals number Q5268/26 refers. - Hazards
- shoal, shallow depth
- Least depth
- 10.5 m (34 ft)
- Cancels
- NW-C-4072-26
- Charts
- 1312(NAD83)
Coast stations for this area
- RCCJRCC QuebecCanada80 NM from the area
- RCCJRCC TrentonCanada231 NM from the area
- RCCRCC BostonUnited States243 NM from the area
- DSCDSC Station SorelJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM11 NM from the area
- DSCDSC Station Trois-RivieresJRCC QuebecCanadaMMSI 003160027VHF 40range 40 NM24 NM from the area
- DSCDSC Station Mont-St. BrunoJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM41 NM from the area
- DSCDSC Station MontrealJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM48 NM from the area
- DSCDSC Station L’AcadieJRCC QuebecCanadaMMSI 003160028VHF 40range 40 NM54 NM from the area
Generated automatically from the warning text on 21 Oct 2026, 18:37 UTC. It can be wrong: the original warning below is the authoritative text.
Keywords
- Geometry refsbounded, polygon
- Dangerous AreaDANGER
- Geometry phrasesarea bounded, bounded by
Message content
NW-C-4431-26
Date
2026-10-21 18:03 UTC
Status
Published
Title
Newly Discovered Dangers
Cancels
NW-C-4072-26
Areas
Montréal to Trois-Rivières
Categories
Shallow Depth Confirmed
Description
Shoal located in area bounded by:
46 10.601N 072 55.122W
46 10.593N 072 55.133W
46 10.602N 072 55.147W
46 10.610N 072 55.136W
Depth: 10.5 metres
In Force Shoals number Q5268/26 refers.
Position
Centroid : 46° 10.602'N 072° 55.134'W
Pt 1: 46° 10.601'N 072° 55.122'W
Pt 2: 46° 10.593'N 072° 55.133'W
Pt 3: 46° 10.602'N 072° 55.147'W
Pt 4: 46° 10.610'N 072° 55.136'W
Charts
1312(NAD83)