Howell Island Conservation Area protected area covering 2,547 acres (10.31 km2) and managed by the Missouri Department of Conservation on Howell Island located in the Missouri River in Boone Township, St. Charles County, Missouri, although the MDOC land surrounding the parking area is in St. Louis County. The island is bounded by the Missouri River on the north side and Centaur Chute to the south. The island is mostly forested in bottomland trees such as sycamore and cottonwood.