![](https://cdn.waterrangers.ca/attachments/239bbe0f777eb8c79ecbd964c99f9d7d52afd5a3/store/fill/300/300/11a8dad9873b5240eaa44ee146d0c31811ebc7d53aed8e8a8c1e099d41dc/IMG_2661.jpg)
Big Rideau Lake
Portland, 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: Big Rideau Lake Association : Big Rideau Lake Water Quality
- Site ID: RVL-39_P10
- Lat: 44.7002999
- Lng: -76.1890999
- Waterbody Type: Lake
- Timezone: America/Toronto
Latest photos
View all photosObservations summary
Observation tests summary
Total kjeldahl nitrogen
μS/cm
0
Latest
472
Average
Total phosphorus
ppm
0.0
Latest
32.0
Average
Water temperature
°C
29.0
Latest
22.3
Average
Air temperature
°C
20.0
Latest
25.0
Average
Dissolved oxygen
mg/L
8.0
Latest
8.9
Average
pH (0-14)
7.8
Latest
8.9
Average
E.coli
cfu per 100mL
22
Latest
13
Average
Conductivity
μS/cm
186
Latest
240
Average
Dissolved oxygen
%
4.5
Latest
71.6
Average
Alkalinity
mg/L
160
Latest
148
Average
Hardness
mg/L
150
Latest
119
Average
Secchi depth
m
0.5
Latest
0.7
Average
Water depth
m
0.8
Latest
0.9
Average
Chlorine
ppm
3.0
Latest
3.0
Average