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
4.0
Latest
10.2
Average
Water temperature
°C
3.9
Latest
11.7
Average
Alkalinity
mg/L
80
Latest
111
Average
Hardness
mg/L
100
Latest
107
Average
Dissolved oxygen
mg/L
8.0
Latest
9.0
Average
Conductivity
μS/cm
276
Latest
275
Average
Secchi depth
m
0.0
Latest
0.0
Average
Water depth
m
0.4
Latest
0.4
Average
pH (0-14)
7.2
Latest
7.1
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
- 2025-02-26
- 2025-02-05
- 2025-01-29
- 2025-01-22
- 2025-01-15
- 2025-01-09
Ice Off
- 2025-03-19
- 2024-12-18
- 2024-12-11
- 2024-11-27
- 2024-11-26
- 2024-11-14