Top of the Season!

Dear faithful followers all,

Thank you for your interest in this site. It helps to keep the motivation up 🙂

I hope you are all healthy and that you have folk you love, to share the joy of the season with. For myself, it has been a disrupted season. We have lots of family, and Covid has been doing its best to assert itself in quite an unhelpful way. However, we have much to be grateful for, and this certainly is the time to acknowledge and celebrate our families and our good fortune.

2021 has been an a relative quiet year concerning the lake, at least science-wise. Certainly covid has curtailed many of the usual activities we all enjoy.

The water levels are as high as I have ever seen them for December, and today they are at 1026′ 10″ as measured at the South Bay stick gauge. The summer levels stayed fairly high as well, compared to previous years.

In 2020/21 we posted an Ice-In date of January 10, 2021 based on Cathy Burgess’s observations. I think this year, once she has made a determination, we will ask around the lake (via the facebook page) just to see that everyone else sees ice as well. Of course, right around the culverts, there likely won’t be any, because of the outlet flow, so we’ll have to ignore that.

Early in 2022, we expect to get a report from David Zilkey, a graduate student working for Prof Katrina Moser of Western, on the effect of invasive species (eg Milfoil) upon nutrient delivery to Gilmour Bay. (This report has been delayed due to the constraints being placed upon the researchers by covid)

Well, I hope that 2022 is a kinder year for humanity, and that you in particular experience much joy, health, and peace.

Hummingbird Departures 1986-2021

Cathy Burgess has been recording the arrival and departure dates for red throated hummingbirds since 1986. The departure date for 2021 was observed to be September 18.

Here is a graph of her data. On a trend line basis the hummers are leaving a week later than they were 35 years ago. A bit more commentary can be found under the Climate Change Signals tab

Website mobile device issues

Dear followers all,

it recently came to my attention that although laptop versions of this website generally worked ok, the mobile versions, such as for an iphone or ipad, did not show many of the charts and pictures.

This, hopefully, has now been remedied.

Please, if you note any malfunctions, it would be highly appreciated if you would let me know.



2020 Lake Partner Program Phosphorus Report for the Kawarthas

The Kawartha Stewards Association (KLSA) recently published this report on phos in their set of lakes. (Chandos is not included).

These lakes are flow-through, meaning that one flows into another, and so phosphorus levels in one lake can affect levels in the downstream lake. It also means that the levels can vary widely.

On a comparative basis, phosphorus levels in Chandos are in the 10 µg/L range,, whereas the Kawartha lakes reported vary widely from 5 to 25.

Secchi Depths at Chandos are in the 5-6m range, whereas in the Kawartha Lakes they range from 2 to to 7.

For more information regarding Chandos, please see the Trophic Status tab, or the Phosphorus tab.

Gilmour Bay Namesake

Gilmour Bay was most likely named after the Gilmour Bay Lumber Baron family from Trenton.

If you have 66 minutes or so, it is very informative to watch the Youtube video “Lumber Baron- The Gilmour Years” at

The last 5 minutes or so has a really hilarious sketch called “the sawmill” -very chaplinesque.

We are most interested in finding out more about the Gilmour Bay lumbering operations.

Chandos lake appears in the map below, but is unnamed. Of course, before 1935 it was called “Loon Lake”.

Radon – What is it and where does it come from?

updated 28 May 2021

The recent interest in the radon health concern has resulted in some questions about radon’s origins. As we know, there is a concern about radioactive radon gas in dwellings, especially those in the Canadian Shield, such as those at Chandos.  Where does this radon come from?  This note attempts to be a bit of a primer on the subject.

The decay of uranium-238 into the radioactive gas radon-222.

Continue reading “Radon – What is it and where does it come from?”