Kinwamakwad (Long) Lake

Kinwamakwad Lake, also known as Long Lake, is a seepage at the University of Notre Dame Environmental Research Center in Gogebic County, Michigan.

The name "Kinwamakwad" possibly comes from the Ojibwe word ginwaakwad, meaning "it is long, is tall".

[4][5] Kinwamakwad Lake has been studied for several decades and is a part of the Global Lake Ecological Observatory Network.

[6] The lake has been used in several whole-lake experiments examining the effects of nutrients and food web structure on lake productivity[7][8] as well as the effects of dissolved organic carbon on lake productivity.

A pair of the unofficial world's largest secchi disks reside in Kinwamakwad Lake, with both disks measuring 2.44 meters in diameter.

Aerial photo of Kinwamakwad Lake (Long Lake) showing the center shallow portion of the lake. A white curtain divides the lake into two basins where the right side is darker due to an increase in dissolved organic carbon by about 50%. The water color difference is shown using two secchi disks which are submerged 0.5 meters below the surface on each side of the curtain. The secchi disk to the left of the curtain is lighter while the disk to the right is darker due to elevated dissolved organic carbon.
Aerial photo of Kinwamakwad Lake (Long Lake) in 2015 during a whole-lake manipulation in which dissolved organic carbon was increased by ~50% in the treatment basin (right of the white curtain in center of the photo). The difference in water color between the two basins can be seen with a pair of unofficial world's largest secchi disks.