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Île Sainte-Thérèse Lower Range Rear Lighthouse

F Green🇨🇦Varennes, CAOperational

Location & Light Range

About Île Sainte-Thérèse Lower Range Rear Lighthouse

This steel skeletal tower stands 13 meters tall, with its light situated 18 meters above the water. The structure is orange with a black vertical stripe and features a square cylindrical design. Established in 1871, the rear range light is located on the east side of Île Sainte-Thérèse, opposite Varennes. It emits a continuous green light, visible for 12.7 nautical miles. The tower carries an orange slatted daymark with a black vertical stripe, aligned with the range line.

Why it matters: This range light is indispensable for guiding vessels safely through the specific channel it marks in the St. Lawrence River, particularly for traffic navigating past Île Sainte-Thérèse towards Varennes.

Light & Optic

Characteristic Signature
F Green
Flash Type
Fixed
Light Color
Green
Raw Code
F G
Focal Height
18m
Geographic Range
12.7NM

Construction & History

First Lit
1871

Significant events: station established 1871

References & Identifiers

Nearest Port
Montreal(9.4 km)
ARLHS No.
CAN-1111

Tower & Structure

Tower Height
13m
Tower Shape
cylindrical
Tower Color
orange with a black vertical stripe
Material
steel

Structure: square cylindrical skeletal tower carrying an orange slatted daymark with a black vertical stripe on the range line

Location

City
Varennes
Country
🇨🇦Canada
Region
Quebec
Sea Region
east side of Île Sainte-Thérèse opposite Varennes
Latitude
45.6837°
Longitude
-73.4602°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Île Sainte-Thérèse Lower Range Rear Lighthouse at night?+
Île Sainte-Thérèse Lower Range Rear 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 Lower Range Rear Lighthouse guide vessels into?+
Île Sainte-Thérèse Lower Range Rear Lighthouse assists vessels approaching 5 nearby ports. The closest is Pointe-aux-Trembles at 2.2 NM to the SSW. Other ports served include Montréal-Est (3.5 NM SSW), Verchères (6.8 NM NE), Montreal (8 NM SSW), Lachine/Montreal (10.7 NM SSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Île Sainte-Thérèse Lower Range Rear Lighthouse still active and maintained?+
Yes, Île Sainte-Thérèse Lower 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 Lower Range Rear Lighthouse?+
You can track vessels near Île Sainte-Thérèse Lower 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.