|Named for John Work Garrett, railroad executive, industrialist, and financier, Garrett County was the last county to be formed in Maryland. Know for its many public parks, state forests and highest waterfall. The northern part of the county is home to the Amish and Mennonite settlers. The Casselman River Bridge State Park has a 80 foot stone arch bridge that was constructed in 1813. The New Germany State Park is popular during the summer months with its beach, camping and picnic area. Deep Creek Lake State Park is Maryland's largest lake.