Middle Run Valley Natural Area was created in 1975.
Dundas Valley Conservation Area was created in 1970.
Turkeyfoot Valley Area School District was created in 1950.
Minnesota Valley State Recreation Area was created in 1969.
Mars Area Middle School was created in 1971.
Roseville Area Middle School was created in 1987.
Union Bay Natural Area was created in 1972.
Tandy Hills Natural Area was created in 1987.
Tideman Johnson Natural Area was created in 1940.
Dukes Research Natural Area was created in 1974.
Sielbeck Forest Natural Area was created in 1998.
The Channels Natural Area Preserve was created in 2008.
Snyder Middleswarth Natural Area was created in 1921.