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Île Sainte-Thérèse Upper Range Front Lighthouse

F Green🇨🇦CAOperational

Location & Light Range

About Île Sainte-Thérèse Upper Range Front Lighthouse

A round, cylindrical concrete tower, 12 meters high, was first lit in 1879. The station was established that year, with the range towers moved in 1884. A second lighthouse was built in 1924. The current structure has a lantern and a double gallery. It emits a green flashing light. The tower is white and stands 11 meters above the water.

Why it matters: This lighthouse guides vessels downstream from Montreal, providing precise alignment for the St. Lawrence River channel. Its continuous green light is part of a range system critical for safe passage.

Light & Optic

Characteristic Signature
F Green
Flash Type
Fixed
Light Color
Green
Raw Code
F G
Focal Height
11m
Geographic Range
10.7NM

Construction & History

First Lit
1879

Significant events: Station established 1879, range towers relocated 1884, second lighthouse built 1924

References & Identifiers

Nearest Port
Montreal(8.2 km)
Admiralty No.
H2490
NGA No.
5512

Tower & Structure

Tower Height
12m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower with lantern and double gallery

Location

Country
🇨🇦Canada
Region
Quebec
Sea Region
Located on the east bank of the Île aux Vaches, a smaller island southeast of the Île Sainte-Thérèse, in Varennes, Quebec. It guides vessels downstream leaving Montréal.
Latitude
45.6640°
Longitude
-73.4662°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Île Sainte-Thérèse Upper Range Front Lighthouse at night?+
Île Sainte-Thérèse Upper Range Front displays the characteristic F Green. 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 Front Lighthouse guide vessels into?+
Île Sainte-Thérèse Upper Range Front Lighthouse assists vessels approaching 5 nearby ports. The closest is Pointe-aux-Trembles at 1.1 NM to the SW. Other ports served include Montréal-Est (2.3 NM SW), Montreal (6.8 NM SSW), Verchères (7.9 NM NE), Lachine/Montreal (9.5 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Île Sainte-Thérèse Upper Range Front Lighthouse still active and maintained?+
Yes, Île Sainte-Thérèse Upper Range Front 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 Front Lighthouse?+
You can track vessels near Île Sainte-Thérèse Upper Range Front 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.