Fens are unusual, and increasingly rare. The water from this fen flows through the thick grasses of the preserve, which help to filter the water before it empties into the River Raisin at the preserve's eastern edge. The River Raisin is one of the best warm water rivers in the state, and three of the four local communities downstream draw all of their drinking water from this river.
The preserve has been impacted by invasive species like glossy buckthorn. In the two decades since buckthorn removal efforts began, staff and volunteers have removed more than 2.5 million adult buckthorn stems, spot burned 10 million buckthorn seedlings, and burned nearly 400 brush piles of adult buckthorn shrubs. In 2010, we celebrated the removal of the last populations of adult glossy buckthorn from the preserve, a monumental milestone.