Latest Monitoring Data
About every 2-3 weeks during the summer (and occationally through the ice), we measure the dissolved oxygen (DO) and temperature every meter at the deepest point of Highland Lake (aka Deep Hole). The below chart shows the most current year and sample days.
Following ice-out (3-25-2022) the surface of the lake heats up and stratifies into layers called the Epilimnion (or the top warm layer), the thermocline / Metalimnion (the middle layer), and the colder Hypolimnion extending to the floor of the lake. This is demonstrated below on the temperature chart post ice-out. During the colder months at the end of the year the surface water cools, becomes dense and sinks causing the lake to "turn over" or mix again. This late season mixing process also reoxygenates the water column.
Temp and DO each have a strong bearing on many physical, chemical and biological processes in our lake ecosystem. DO levels are affected by water temperature, but also the algae/organic decomposition process which consumes oxygen.