O'Brien Lake
Ontario, Canada
![](https://cdn.waterrangers.ca/attachments/27824b3a6206527fe2ad93198da3bf0597ce2605/store/fill/150/150/f3b319f7dca185b310d65b6293a3fb59fe8bf66f733d2847cf9dd2d6e906/Rideau-Valley-Conservation-Authority.jpg)
Location created by
RVCA Lake Monitoring Program
- Group: Rideau Valley Conservation Authority : Watershed Watch Program
- Site ID: RVL-02_DP1
- Lat: 44.7725
- Lng: -76.4667
- Waterbody Type: Lake
- Timezone: America/Toronto
Latest photos
No photos uploaded.
Observation tests summary
Total kjeldahl nitrogen
μS/cm
0
Latest
399
Average
Total phosphorus
ppm
0.0
Latest
12.8
Average
Air temperature
°C
16.6
Latest
20.6
Average
Water temperature
°C
22.9
Latest
19.7
Average
Secchi depth
m
4.0
Latest
5.3
Average
pH (0-14)
8.1
Latest
8.0
Average
Dissolved oxygen
mg/L
9.0
Latest
9.2
Average
Conductivity
μS/cm
180
Latest
181
Average
Dissolved oxygen
%
104.6
Latest
107.1
Average
Calcium
ppm
23.4
Latest
23.4
Average