Big Fork State Forest, State forest in Itasca and Koochiching Counties, United States.
Big Fork State Forest spans more than 127,000 acres across northern Minnesota and features rolling hills formed by glacial activity, scattered lakes, open wetlands, and dense northern hardwood forests. The terrain shifts between wet lowlands and elevated wooded ridges that define the landscape.
The forest was officially established as a protected area in 1963 and harbors the Lost 40 section, where original old-growth trees have stood untouched for over a century due to a surveying mistake. These ancient trees offer a rare window into what the region's forests looked like before logging.
The forest reflects Minnesota's deep ties to outdoor living, where hunting, fishing, and watching wildlife remain central to how people spend their time in the region.
The forest has several access points and a trail network for hiking, mountain biking, and cross-country skiing depending on the season. Visitors should expect hilly terrain and trails that range from easy to challenging.
The forest is home to Minnesota's largest red pine tree, and the Big Fork River flows through it with rapids varying from gentle Class I to extreme Class V waters. This mix of notable trees and challenging whitewater makes it special for different kinds of visitors.
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