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Île Sainte-Thérèse Upper Range Rear Lighthouse

F Green 5s🇨🇦Varennes, CAOperational

Location & Light Range

About Île Sainte-Thérèse Upper Range Rear Lighthouse

First lit in 1879, this Canadian range rear light is situated off the east bank of Île Sainte-Thérèse near Varennes. The 22-meter tall square skeletal mast stands on a concrete pier, reaching a focal height of 27 meters. Its tower is painted red with a black vertical stripe. The structure guides vessels with a continuous green light, visible for 14.7 nautical miles. The pentagonal concrete pier features a pointed end, designed to break up ice floes common in the region.

Why it matters: This light provides a critical alignment point for vessels navigating the channels near Île Sainte-Thérèse, aiding safe passage through an area subject to ice and currents.

Light & Optic

Characteristic Signature
F Green 5s
Flash Type
Fixed
Light Color
Green
Interval
5s
Raw Code
F G
Focal Height
27m
Geographic Range
14.7NM

Construction & History

First Lit
1879

References & Identifiers

Nearest Port
Montreal(9.1 km)
Admiralty No.
H2490.1
NGA No.
5516

Tower & Structure

Tower Height
22m
Tower Shape
square
Tower Color
red with a black vertical stripe
Material
concrete

Structure: square skeletal mast mounted on a robust pentagonal concrete pier

Location

City
Varennes
Country
🇨🇦Canada
Region
Quebec
Sea Region
just off the east bank of the Île Sainte-Thérèse in Varennes
Latitude
45.6774°
Longitude
-73.4600°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Île Sainte-Thérèse Upper Range Rear Lighthouse at night?+
Île Sainte-Thérèse Upper Range Rear displays the characteristic F Green 5s. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The green color may indicate a specific sector or warning zone.
Which ports and harbors does Île Sainte-Thérèse Upper Range Rear Lighthouse guide vessels into?+
Île Sainte-Thérèse Upper Range Rear Lighthouse assists vessels approaching 5 nearby ports. The closest is Pointe-aux-Trembles at 1.9 NM to the SSW. Other ports served include Montréal-Est (3.1 NM SSW), Verchères (7.1 NM NE), Montreal (7.6 NM SSW), Lachine/Montreal (10.4 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Île Sainte-Thérèse Upper Range Rear Lighthouse still active and maintained?+
Yes, Île Sainte-Thérèse Upper Range Rear Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
How can I track vessels near Île Sainte-Thérèse Upper Range Rear Lighthouse?+
You can track vessels near Île Sainte-Thérèse Upper Range Rear Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.