A special committee of the Lighthouse Board sent to the Great Lakes in 1864 determined that lights were needed in Green Bay on Chambers Island, Peshtigo Reef, and at the entrance to the Fox River. Although Congress appropriated $11,000 for range lights on Grassy Island by 1866, the project could not proceed until a cut being dredged through Grassy Island to straighten the channel leading to the mouth of the Fox River was finished.
Writing in 1867, James B. Quinn, a lieutenant with the United States Engineers, noted the following about the improvements being made to the channel leading to the mouth of the Fox River.
In the present condition of the entrance [at Green Bay] a vessel can get out of Chicago harbor loaded with one hundred tons more freight than it can from this; and by reason of its tortuousness, it is entirely inaccessible by night, and dangerous at all times. …
In contemplation of the easier access to Green bay that the present improvement will allow, when completed, vessel owners are calculating upon receiving the freight of Minnesota and northwestern Wisconsin entirely at this port, instead of receiving a large portion of it at Milwaukee and Chicago, as at present. In consequence of the crooked channel, and the difficulty and expense of navigating it, it costs from three cents to four cents per bushel more to ship wheat from this port to the same ports eastward.
Work on dredging the channel commenced in the fall of 1866, but due to problems with the dredge, little was accomplished that year. During 1867, new machinery was used to cut a nine-and-half-foot-deep channel through Grassy Island, and over the next few years the channel was dredged to a greater depth and extended north and south of the island. In 1870, the sides of the cut through Grassy Island were revetted with sheet piling to stabilize the banks.
The Grassy Island Range Lights were positioned on the eastern side of the cut, and a two-story keeper’s dwelling was built between the lights – 500 feet from the front light and 140 feet from the rear light. The front tower measured twenty-seven feet from its base to its ventilator ball, while the rear tower was seven feet taller. Both towers were thirteen feet square at their bases and tapered to eight feet square at their lantern rooms, which were octagonal and had a diameter of six feet. The towers’ Fresnel lenses were manufactured in Paris, France by Henry-Lepaute. Joseph B. Wing was appointed the first keeper of the range lights.
During a gale in November 1873, water swept over Grassy Island and carried away the walkways that lead to the outhouse, well, and woodshed. The station’s well was also filled in by the gale, but it wasn’t a big loss as the keeper had been using the bay as a primary water source. A new well, 139 feet deep and equipped with a pump, was drilled near the dwelling in 1884 and lined with four-inch iron pipe.
An area on the first floor of the dwelling, fitted with an oil-butt stand, was used as an oil house until a detached brick oil house was built in 1901. A landing for the station’s boathouse was located adjacent to the rear tower.
After being in charge of the range lights for just over twenty-three years, Joseph Wing died in 1895 and was replaced by Ole Hansen, who had previously been keeper of Algoma Lighthouse. In 1901, during the service of Ole Hansen, the position of assistant keeper was added to the station. At the close of 1901, Hansen swapped assignments with Louis Hutzler, who was in charge of Long Tail Point Lighthouse.
A Wisconsin newspaper noted on December 8, 1911 that Joseph Herdina, assistant keeper of the range lights, was missing and believed to have drowned in Green Bay. Keeper Hutzler reported the disappearance of his assistant to the district attorney and said that he believed the thirty-year-old man had committed suicide.
The range lights kept their fixed white signature until 1934, when the fuel for the lights was changed to acetylene gas and the characteristic of the rear light became fixed green and that of the front light a green flash every five seconds. As sun valves had been installed to light and the extinguish the lights, a resident keeper was no longer needed, and Keeper Louis Hutzler retired from the Grassy Island station after having served there for over thirty years.
Dredging on the entrance channel had to be performed almost annually to maintain the desired depth and also to accommodate larger ships. In 1966, the Corps of Engineers was planning on widening the channel through Grassy Island and removing the land on which the range lights stood. The Coast Guard had decided to demolish the structures on site, but Elmer Dost of the Green Bay Yacht club contacted the Corps about the possibility of acquiring the lighthouses. Carl Petersen of the Corps helped the club obtain the lights, and they were relocated to the club’s property on the east side of the entrance to the Fox River in November 1966.
The lighthouses stood on a paved area on the north side of the club’s harbor until 1998, when they were relocated to the breakwall on the west side of the harbor. At this time, a restoration effort was launched that took roughly $400,000 and several years to complete. The restored Grassy Island Range Lights were dedicated at a public ceremony held on November 5, 2005.
A small remnant of Grassy Island still remains to this day, and it is home to a navigational light and a pelican rookery.