Theresa Marsh State Wildlife Area – Northern Unit

This property is located in Dodge County (Northern Unit), and Washington County (Southern Unit). Combined, the two units offer 5,990 acres of grasslands, marsh, woodland, and cropland. Solomon Juneau first dammed the Rock River here to power grain and saw mills; the resulting flowage created ideal wildlife habitat. At the turn of the century, the dam was removed to facilitate agricultural ventures that ultimately failed. The DNR began purchasing land here in 1948. They constructed an earthen dam that created the 1,500-acre flowage, additional marshes and waterfowl refuges that exist today. It’s a great place to hike, canoe, kayak and view wildlife – especially birds.

Directions: From Lomira, travel south 4 miles on Hwy 41 to Hwy 28 west. Access the marsh via Mohawk Rd on the east side, or Pole Rd on the west.

Theresa Marsh State Wildlife Area - Northern Unit map

Gazetteer: Page 46, D-2 (prior to 10th edition). | Page 79, F-7 (10th edition).

Phone: 920/387-7860 (WDNR Horicon).

Web site: WDNR Theresa Marsh State Wildlife Area

Signature species: American Wigeon, Northern Pintail and Canada Goose.

Rare species: Great Egret, Wilson’s Phalarope and Northern Saw-whet Owl.

Parking: Parking lots.

Nearest food & lodging: Mayville.