Just released by the CRCA: CRCA Lake Assessment Report fact sheets were produced for 45 lakes in the Cataraqui region. They provide maps, note the physical features, assess water quality, identify the invasive species and outline aquatic diversity.
Check it out! CRCA Lake Reports
The report for North Otter Lake is attached. There does not seem to be a separate report for South Otter or for Pearkes (Elbow Lake).
North and South Otter Lake Association - NSOLA 