All clear beneath Copper Harbor

Lake Superior, Copper Harbor, MI by Michigan Nut Photography

Let’s stay up on the Keweenaw Peninsula today with a look at the crystal clear waters of Lake Superior as seen from under the surface of Copper Harbor! For almost all my life, Lake Superior has been the cleanest & clearest of the five Great Lakes. Imagine my surprise to learn that in 2017, Lake Michigan & Lake Huron were found to be more clear than Lake Superior:

While Lake Superior has not gotten any dirtier, lakes Huron and Michigan have gotten significantly clearer in the past 20 years or so, a study published earlier this year in the Journal of Great Lakes Research found.

Anecdotally, scientists knew water clarity was improving in those lakes. But it hadn’t been quantified.

“What surprised us was the magnitude of the change,” said Robert Shuchman, a study co-author and co-director of the Michigan Tech Research Institute. “We had no idea the data was going to tell us that Huron and Michigan have surpassed the water clarity in Lake Superior. That was the startling piece.”

Scientists analyzed satellite images of the lakes captured between 1998 and 2012. Over that period, they found, the depth that light could penetrate down into the water — known as the photic zone — increased by about 20 percent in lakes Michigan and Huron.

They attribute part of that change to less phosphorous runoff. Climate change also likely plays a role. But the dominant factor is the explosion of invasive zebra and quagga mussels in the lakes since the late 1990s, researchers concluded.

Some of the highest abundances of quagga mussels in the world are found in Lake Michigan, said Gary Fahnenstiel, a senior research scientist at Michigan Tech and study co-author.

So in the end, not great that Michigan & Huron passed Superior in this. I looked to see if anything had changed in that regard, but it appears not.

You can view & purchase a bunch more photos of this wild place including some more underwater shots in the Porcupine Mountains & Keweenaw Peninsula gallery on MichiganNutPhotography.com!

Lots more Lake Superior on Michigan in Pictures!