The Field Station owns almost 80 acres of one of the finest mature beech-maple forests remaining in southeastern Wisconsin. Eighteen acres of high quality beech-maple forest adjacent to the Field Station was purchased by the Nature Conservancy in 1991 for eventual donation to the Station. This parcel is being managed by the Station. Like the Cedarburg Bog, the beech-maple forest has been designated a State Natural Area, and is classified as a National Natural Landmark by the Department of Interior.