Wikipedia’s entry on the Tahquamenon River explains that because the headwaters of the river are located in a boreal wetland that is rich in cedar, spruce and hemlock trees, the river’s waters carry a significant amount of tannin in solution and are often brown or golden-brown in color. The Tahquamenon Falls are thus the largest naturally dyed or colored waterfall in the United States
Lots more about the Tahquamenon Falls on Michigan in Pictures.
Get out there and see something amazing this weekend!!