RVL-39_P7 : Big Rideau Lake

Portland, Ontario, Canada

Observed by
Ann White

Water Quality Tests

pH (0-14) What's this? 9.0
Dissolved Oxygen (mg/L) What's this? 8.0
Secchi Depth (m) What's this? 0.8
Chlorine (ppm) What's this? 1.0
Hardness (mg/L) What's this? 100.0
Alkalinity (mg/L) What's this? 120.0
Water Depth (m) What's this? 0.95
Conductivity (uS/cm) What's this? 235.1
Dissolved Oxygen (%) What's this? 6.0
Air Temperature ℃ What's this? 30.8
Water Temperature ℃ What's this? 28.2


Current Weather What's this?
  • sunny
Hot, humid, light wind
Weather in previous 24 hours What's this?
  • sunny
Hot, humid

Latest Photos


The water had a lot of suspended dirt, mud and the bottom of the lake was not visible at the end of the dock. It was clearer near shore.

The dock that was used as a test location in the past has been replaced with the new one in the picture.

At the testing location near the seniors home, I learned that parts of Portland harbour had a weed removal procedure the week before. This area may have been cleared out.

A boat arrived at the new gas pump location across from test location.