St. Lawrence River
Ontario, Canada
Location created by
River Institute
- Group: River Rapport & Education : River Institute
- Lat: 45.0111657
- Lng: -74.7337608
- Waterbody Type: River
- Timezone: America/Toronto
Latest photos
Observations summary
Observation tests summary
Air temperature
°C
-11.0
Latest
11.1
Average
Water temperature
°C
0.1
Latest
12.9
Average
Alkalinity
mg/L
80
Latest
115
Average
Hardness
mg/L
100
Latest
112
Average
Dissolved oxygen
mg/L
10.0
Latest
9.5
Average
Conductivity
μS/cm
278
Latest
274
Average
Secchi depth
m
0.0
Latest
0.0
Average
Water depth
m
0.4
Latest
0.4
Average
pH (0-14)
6.0
Latest
7.0
Average
Dissolved oxygen
%
94.7
Latest
94.7
Average
Turbidity
NTU
0.8
Latest
0.8
Average
Chlorine
ppm
0.0
Latest
0.0
Average
Ice On
- 2025-02-05
- 2025-01-29
- 2025-01-22
- 2025-01-15
- 2025-01-09
Ice Off
- 2024-12-18
- 2024-12-11
- 2024-11-27
- 2024-11-26
- 2024-11-14