Uncover a glimpse of Missouri’s early history in Jefferson County at a variety of state parks and historical sites. At Washington State Park, you’ll find 1,000-year old petroglyphs and rock carvings inside the 1,875-acre park. There are also several stone structures built by the Civilian Conservation Corps during the Great Depression.
You’ll also want to check out the Mastadon State Historic Site. The 425-acre grounds preserve the Kimmswick Bone Bed, which contains important paleontological and archaeological sites. It’s also the oldest Native American site in the Missouri State Park system.
Jefferson County is also home to two significant bridges: the Windsor Harbor Road Bridge and the Sandy Creek Bridge. The Windsor Harbor Road Bridge oldest known wrought iron bridge in Missouri, built in 1874. The Sandy Creek Bridge is one of only four remaining covered bridges in Missouri and sits on 205 acres of land with picnic facilities.