Rock Island State Preserve is a 17-acre area with a sand prairie, a wetland, and a woodland, featuring sixty species of butterflies and over 130 plants.
Hartley Fort State Preserve features the remains of a prehistoric fortified village. This 2-acre, privately owned preserve is located along the Upper Iowa River
The 32.5-acre Merrill A. Stainbrook State Preserve features a unique combination of rich fossiliferous limestone and a rare display of glacial grooves.
The “Vincent” name reflects the family name of the last owners. This 35-acre preserve contains prairie remnants located in a valley surrounded by loess ridges.
Eureka Woods is a privately owned, 90-acre preserve along the North Raccoon River near Jefferson in Greene County, dedicated as a state preserve in 2005.