Lock 20
The St-Lawrence seaway, established in 1958, has been modified to increase its depth, allowing larger ships to navigate through the Great Lakes. As a result, this dive site in Canada near Chemin de la Baie, Rivière-Beaudette, Vaudreuil-Soulanges, Montérégie, Quebec, J0P 1R0, offers a mesmerizing view for divers with numerous submerged villages, roadways, locks, powerhouses, and canals.
Divers can enjoy an immersive underwater exploration at this site, which offers a maximum depth of 14m and visibility of 4m. Please note that this dive site is recommended for advanced divers. For more detailed information, you can visit the following link: Dive Site Information.
Divers can enjoy an immersive underwater exploration at this site, which offers a maximum depth of 14m and visibility of 4m. Please note that this dive site is recommended for advanced divers. For more detailed information, you can visit the following link: Dive Site Information.
Diving Conditions Score for Lock 20
5.2
AverageAverage conditions, be alert.
The score is based on a calculation of the current weather and sea conditions.
Dive Site Overview for Lock 20
Depth
14m
Visibility
4m
Experience Level
advanced
Weather Conditions for Lock 20
Wave Height
1m
Wind Speed
20.3 m/s
Water Temp
18°C
Visibility
16.5km
Cloud Cover
99%
Wave Period
8s
Air Temperature
18.2°C
Precipitation
0.1 mm
Detailed 7-Day Diving Forecast for Lock 20
Alpha
Dive Score Chart for Lock 20
Best time to dive: 10:00 with score 6.750633333333333/10. Water conditions: Waves 1m, Wind 12.2 m/s.Best night dive time: 2:00 with score 6.164233333333333/10.
Chart showing hourly dive conditions including wave height, wind speed, water temperature, and visibility throughout the day.
Sunrise at Lock 20: 06:00
Sunset at Lock 20: 18:00
Optimal diving conditions at Lock 20 are affected by daylight hours. Sunrise occurs at 06:00 and sunset at 18:00, which impacts visibility and water temperature for scuba diving and snorkeling.
Best Overall
10:00Score: 6.8/10
Waves: 1m (8s), Wind: 12.2 m/s
Safest Overall
6:00Score: 6.7/10
Waves: 1m (8s), Wind: 12.4 m/s
Best Night
2:00Score: 6.2/10
Waves: 1m, Wind: 14.6 m/s
Seasonal Analysis for Lock 20Alpha
Historical patterns and best seasons for diving at Lock 20
The dive score combines all factors to rate overall diving conditions throughout the year. Higher scores indicate better diving conditions.
Monthly Dive Score Analysis - Seasonal Diving Conditions
Higher values indicate better diving conditions
Seasonal DiveScore Chart
This chart displays monthly diveScore data throughout the year, showing seasonal patterns. The data is presented as a bar chart with an overlaid line graph.Dive scores range from 1 to 10, with 10 being optimal conditions.
Higher values indicate better diving conditions
Best Season for Lock 20
Winter
Avg. Score: 8.2/10
Winter offers the best overall diving conditions with calmer seas and better visibility, despite cooler temperatures.
Best Months for Lock 20
January
Score: 8.5
February
Score: 8.0
December
Score: 8.0
Ideal Conditions for Lock 20
Water Temp
21.3°C / 70.3°F
July
Visibility
14.6m / 47.9ft
January
Wave Height
1.1m / 3.6ft
January
Wave Period
8.0s
January
Seasonal Insights for Lock 20
Lock 20 shows typical northern hemisphere patterns with July being the warmest month (21.3°C) and January the coldest (-15.0°C). The calmest conditions typically occur in January with average wave heights of 1.1m and wave periods of 8.0s. The most comfortable wave conditions are in January with a low wave steepness ratio, creating gentler swells. January offers the longest wave periods (8.0s), creating more comfortable and predictable conditions for boat entries and exits. Ocean currents are slowest in January (0.5m/s) and strongest in January (0.5m/s). May is usually the driest month with 0.0mm of precipitation. For beginners, the best time to visit would be during January to March, when ocean conditions are calmer with long-period waves and currents are typically weaker. Experienced divers might enjoy the challenges and potentially better visibility during the shoulder seasons, with moderate currents that can improve marine life encounters.
Last updated: 1 min. ago - Jun 20, 2026
Note: This dive site is not a verified dive site. Please dive with caution. This dive site might have incorrect information by the community.
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