U.S. Bureau of Lighthouses

Ashland Harbor Breakwater Light (Ashland County, Wisconsin)
A hexagonal reinforced concrete tower at the foot of the Ashland breakwater.
East Charity Shoal Light (Jefferson County, New York)
Green Bay Harbor Entrance Light (Brown County, Wisconsin)
Automated Lighthouse, Marking the Shipping Lane to the Green Bay Harbor
Superior Entry South Breakwater Light (Douglas County, Wisconsin)