Rock Creek

Rock Creek is an independent stream in northern Jefferson County. It originates on the divide between the Meramec Basin and its own, small basin. Rock Creek passes Mastodon State Park, where it receives its one lone named tributary: Black Creek. The creek crosses under Interstate 55 and into the city of Kimmswick, where it enters the Mississippi River downstream of Chesley Island. Rock Creek is floatable, but there are no outfitters along its short length.