About the Refuge

About the Station

Green Bay National Wildlife Refuge consists of Hog Island (2 acres), Plum Island (325 acres), Pilot Island (3.7 acres), St. Martin Island (1,260 acres, not entire island), and Rocky Island (10 acres). The islands are located in Lake Michigan, near Washington Island, off the tip of Wisconsin’s Door Peninsula. 

In 1912, Hog Island was set aside as a preserve and breeding ground for native birds. Green Bay National Wildlife Refuge became the 28th refuge in the U.S. and second in the Great Lakes region. Hog Island and nearby Gravel Island National Wildlife Refuge (Gravel and Spider Islands) make up the Wisconsin Islands Wilderness Area.

Plum and Pilot Islands were transferred from the U.S. Coast Guard to the U.S. Fish and Wildlife Service in 2007. The islands were acquired to protect additional migratory bird and endangered species habitat in the Great Lakes Basin Ecosystem. All public use is prohibited on Hog and Pilot Islands due to ground nesting by migratory birds and the limited and treacherous access. 

Green Bay National Wildlife Refuge is managed as part of a complex that also includes Horicon National Wildlife Refuge, 22,000 acres near Mayville, WI; Fox River National Wildlife Refuge, 1,054 acres in Montello, WI; Gravel Island National Wildlife Refuge, 27 acres, located in Lake Michigan near Washington Island, WI; and Leopold Wetland Management District, 57 waterfowl production areas, totaling 13,000 acres, located in 17 counties throughout Wisconsin. Staff work to manage wildlife, habitat, and recreational opportunities on these areas within the complex. 

Green Bay and Gravel Island NWRs Staff

Complex Project Leader   Bill_Peterson@fws.gov  920-387-2658 x111    

Deputy Project Leader  David_Bolin@fws.gov   920-387-2658 x120

Federal Wildlife Officer    Adrian_Potwin@fws.gov    920-948-2579 (cell) or  1-844-NWR-TIPS (1-844-697-8477)

Office Directions:

The office/visitor center is located on the east side of Horicon Marsh, 3.5 miles south of State Highway 49 on County Road Z

Horicon National Wildlife Refuge (Office/Visitor Center)
W4279 Headquarters Road
Mayville, WI 53050
Phone: 920-387-2658
1-800-947-3529 (V/TTY)

Email: greenbayrefuge@fws.gov