[2] The Theresa Marsh Wildlife Area is a 5,990-acre (2,420 ha) state park that includes grassland, cattail, brush marsh, woodlands, agricultural land, seasonally flooded wetlands, and permanent wetlands.

Most of the forest was cut during a period of settlement by whites, and a corduroy road was built across the marsh.

[2] Solomon Juneau settled the area in 1852 and named the village after his mother, Theresa.

After the agricultural businesses failed because of flooding, the Wisconsin Department of Natural Resources completed its land acquisitions, begun in 1948, in 1964.

Dikes were constructed, along with water control features operated to provide waterfowl habitat.