The Elk River Chain of Lakes (ERCOL) is the largest subwatershed of the Grand Traverse Bay watershed and covers 500 square miles of land, has over 60 square miles of open water, and covers 200 miles of shoreline. Home to 14 interconnected lakes and rivers, 138 miles of which are designated Blue Ribbon trout streams, this is a unique area with a significant impact on the region. From the uppermost lake in the chain, the waters flow 55 miles and drop 40 feet in elevation on their way to the bay. The ERCOL empties into east Grand Traverse Bay through the Elk River in Elk Rapids, providing approximately 60% of the bay’s input of surface water.

Villages in the Elk River Chain of Lakes include Elk Rapids, Kalkaska, Bellaire, Mancelona, Central Lake, and Ellsworth. Characterized by a generally rural population and large portions of natural land cover, the Elk River Chain of Lakes watershed possesses a wealth of natural resources that contribute to the health of local human and wildlife communities. The lakes and streams found in the ERCOL are some of the most pristine inland waterbodies in the entire country and provide a multitude of recreational and economic benefits for both residents and visitors. The watershed includes several parks and recreation areas – including 36 public boat launches – that provide opportunities for engaging with its natural features.