Lake Conditions on Salt Spring I.

Lake levels for three of the Salt Spring Island drinking water sources are posted here approximately one month later than measurements were recorded.

St. Mary Lake

Click here for most recent data posted by North Salt Spring Waterworks District.


September 5, 2018 = 40.211 metres above sea level

This is approximately 3 cm higher than the same time of year in 2015 and 2009, two droughty years.

August 22, 2018 = 40.277 metres above sea level

July 25, 2018 = 40.435 metres above sea level

May 25, 2018 = 40.708 metres above sea level

February 22, 2018 = 40.87 metres above sea level

Reached highest level ever recorded in January 2018.


In July 2018, 1.0mm of rain was reported at St. Mary Lake weather station.

In both May 2018 and February 2018 rainfall at St. Mary Lake weather station was less than 50% seasonal average.

Other water quality notes:

There have been no reported cyanotoxins in the raw St. Mary Lake water to date in 2018.

NSSWD publishes results of testing for cyanotoxins in St. Mary Lake raw (and treated) water, here.

Maxwell Lake


September 6, 2018 = 314.114 metres above sea level

This is approximately 5cm higher than in drought years 2014 and 2009, at the same time of year.

For archival data, please refer to the North Salt Spring Waterworks District website, here.

Cusheon Lake


Sept 6, 2018 and also on Sept 19, 2018 = 92.354 m above sea level.

July 20, 2018 = 92.568 m above sea level.

June 4, 2018 = 92.682 m above sea level.

Secchi disk:

Sept 19, 2018 was visible to 4.8 metres. (with noticeable algae)

July 20, 2018 was visible to 4.75 metres. (The higher the number, the greater the water clarity.)

Other water quality notes from Cusheon Lake reports given by a representative of the Beddis Water Commission to SSIWPA Steering Committee:

The oxygen below 6m depth from surface and lower is a negative measurement (September 19, 2018). There could be methane or hydrogen sulfide production at lower depths, which is not uncommon. Temperature reported for Sept 19, 2018 was 17.9 degrees Celsius, which is showing a rapid decline in temperature and the lake was reported “almost mixed” on this date.

A report by CRD Aquatic Ecology laboratory showed Cryptosporidium cysts on May 11, 2018.

The CRD website has data for all CRD-managed water systems on Salt Spring Island.

Full reports delivered by the Beddis Water Service Area representative in SSIWPA meetings are posted here.