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Middlefork Savanna is a of 687 acres (278 ha) nature preserve in Lake Forest, Illinois. Several biomes including oak savannas, dry-mesic prairies, wet-mesic prairies, marshes, deciduous woodlands, and sedge meadows as well as a portion of the North Branch of the Chicago River are found in the preserve. The Middlefork Savanna also contains 25 acres (10 ha) of the “highest quality tallgrass savanna of its kind” in the United States. Such ecosystems are globally endangered. The preserve includes 5.5 miles of gravel trails for hiking and cross-country skiing as well as 4.2 miles of trails for biking. It is managed by Lake County Forest Preserves.
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