Allenton and Theresa Marsh State Wildlife Area

The Allenton SWA is strung along the East Branch of the Rock River in western Washington County. It is the site of an old glacial lake that is today wooded bottomland. There are two 10-acre impoundment lakes on the property along with several dozen small ponds and other wetlands, making it a good place for birders. The larger Theresa Marsh is located north of the Allenton SWA; about half the property is in Washington County with the other half in Dodge County. Together, these two properties offer more than 7,000 acres to explore. They are often thought of as a mini-Horicon Marsh; many of the same birds and wildlife can be found in both places.

Allenton and Theresa Marsh State Wildlife Area map

Directions: From Allenton, travel Cty W south 2 miles to the property. Theresa SWA can be accessed by traveling north 4 miles on Hwy 41 to Cty D west. (Or, see Theresa SWA in the Dodge County section.)

Gazetteer: Page 38, A-3 (prior to 10th edition). | Page 87, A-8 and Page 79, F-7 (10th edition).

Phone: 414/263-8500 (WDNR Southeast Region Headquarters).

Web site: WDNR Allenton Marsh Wildlife Area | WDNR Theresa Marsh Wildlife Area

Signature Species: Sandhill Crane, Marsh Wren, Swamp Sparrow and Snow Geese.

Rare species: Rough-legged Hawk, Northern Harrier, Bobolink and American Bittern.

Parking: Parking lots.

Nearest food & lodging: Allenton and West Bend.