Port Sanilac Light placement and the unique shape were dictated by and created because of budgetary constraints (Congress appropriated only half the money requested). Designed by Eleventh District Engineer Captain Charles E. L. B. Davis, the design has been called "both unique and architecturally significant in its elegance." The tower is white with a red roof. This "handsome" lighthouse shares its design with only one other, Ile Aux Galets, also known as Skilligallee Island Light, on Lake Michigan. The Port Sanilac Light tower is capped with a cast iron lantern room, which still houses a fourth order Fresnel lens manufactured by Barbier and
Port Washington Light and all its interior supports. When the breakwater light was fully automated in 1975–76, the old light continued to house other Coast Guard personnel until 1993, when the building was turned over to the Port Washington Historical Society, first on a leased basis and then in 1997 in full ownership. The Port Washington area was home to many Luxembourgish immigrants, and in 2000 the Luxembourg Minister of Sites and Monuments visited the area. Upon touring the old light, he offered, on behalf of the grand duchy, to provide a replacement tower and lantern in order to restore the light to