Gravelly Shoal Light is an automated lighthouse that is an active aid to navigation on the shallow shoals extending southeast from Point LookoutWobser, Dave, Gravelly Shoal Light , at boatnerd.com. on the western side of Saginaw Bay. The light is situated about offshore and was built to help guide boats through the deeper water between the southeast end of Gravelly Shoals and Charity Island. Architecturally this is considered to be Art Deco style.

History As part of President Roosevelt's New Deal and its program to "Put America Back to Work" the new light tower was put up for bid, and built in 1939.Lighthouse Central, Gravelly Shoal Light Photographs, History and Directions, The Ultimate Guide to East Michigan Lighthouses by Jerry Roach (Publisher: Bugs Publishing LLC - July 2006). ; . It replaced an earlier gas-lit buoy. It also displaced the Charity Island Light,Bostwick, Violet M., Charity Island Light, Boatnerd.com. which was constructed in 1857, and operated until 1930.

Contemporary unmanned lights in the Art Deco style are the Indiana Harbor East Breakwater Light and its twin, the better known Port Washington Breakwater Light in Wisconsin. Note that the document has a picture of the Indiana Harbor East Breakwater Light under "Indiana Harbor Light", and that it has the correct history and wrong picture under "Indiana Harbor East Breakwater Light"

When built according to its original specifications, the contractor warned that the foundation was inadequate to withstand the buildup of ice, and put in a bid for a contract modification. However, at the time jurisdiction over the light had just been transferred to the Coast Guard from the United States Lighthouse Service, and they chose to disregard the warning, and to accept the light as built. This resulted in substantial additional expense in due course, as the light had to be retrofitted.

This light is designed as an autonomous automated electrified station. It is under the control and maintenance of Coast Guard Station in Tawas City, Michigan. Ordinarily it displays a 15,000 candela light powered by a 120 volt electric lamp. Power is supplied through a submarine cable, which crosses the shoal from Point Lookout. The focal plane makes its flash (1-second every 5 seconds) visible for . It is supplemented by a standby 110 candela acetylene light with a half second flash every three seconds—which activates automatically if there is a power failure. In foggy weather, mariners are warned by twin compressed-air two-tone #3 diaphones, which operate on a 30-second cycle (3-second blast followed by 27 seconds of silence).

The National Data Buoy Center lists the Site Elevation as above sea level; an automatic readout for wind, waves and weather is operated there.

The National Weather Service operates an automated weather observing station at the lighthouse.

An added large steel tower atop the light is a radio beacon. The 1953 Coast Guard Light List indicates that the signal transmitted at 296 kHz, send forth a group of half-second dashes for 15.5 seconds, followed by 14½ seconds of silence. As of 2001, both the light and radio beacon served as active navigational aids.

Although it never had a resident lighthouse keeper, this light is a recognized 'significant light" by the National Park Service National Maritime Initiative.National Park Service Maritime History Project, Inventory of Historic Light Stations. Significant Unmanned Aids.

In July of 2015, the light was for sale through an online GSA auction process.

Viewing

A good passing view of the light can be had while riding the ferry from Au Gres to Charity Island, which is to the east in the middle of Saginaw Bay. Tours of Charity Island are available, which include seeing the rebuilt Charity Island Light lightkeeper's house (currently an Airbnb) and seeing the native plants and birds on the western part of the island. More information about a tour to Charity Island can be found at CharityIsland.net.

It is also possible to take a telephoto shot from the shore of mainland Arenac County.

US 23 north from Au Gres, to Point Lookout Road. Turn right to its end; turn left onto Michigan Ave. Through a break in the houses one can see Saginaw Bay and the light.

See also Lighthouses in the United States

Notes

Further reading

Bibliography on Michigan lighthouses. Detroit News Interactive map on Michigan lighthouses.

, Great Lakes Light Keepers Association. Harrison, Tim (editor of Lighthouse Digest and President of the American Lighthouse Foundation), (September, 2009) Ghost Lights of Michigan (Rare historic images and text on Michigan's lost and obscure lighthouse, including bonus chapters on lightships and lighthouse tenders.) East Machias, Maine: Foghorn Publishing, . Hyde, Charles K., and Ann and John Mahan. The Northern Lights: Lighthouses of the Upper Great Lakes. Detroit: Wayne State University Press, 1995. . Map of Michigan Lighthouse in PDF Format. Michigan Light List. Michigan Lighthouse Conservancy. Map of Michigan Lighthouses. Michigan Lighthouse Fund. Michigan Lighthouse Conservancy. Oleszewski, Wes, Great Lakes Lighthouses, American and Canadian: A Comprehensive Directory/Guide to Great Lakes Lighthouses, (Gwinn, Michigan: Avery Color Studios, Inc., 1998) . Penrod, John. Lighthouses of Michigan, (Berrien Center, Michigan: Penrod/Hiawatha, 1998) . Penrose, Laurie and Penrose, Bill Traveler's Guide to 116 Michigan Lighthouses, Petoskey, Michigan: Friede Publications, 1999. . Pepper, Terry, President Great Lakes Lightkeepers Association, Seeing the Light: Lighthouses on the western Great Lakes Roach, Jerry. Lighthouse Central, Michigan Lighthouses. The Ultimate Guide to East Michigan Lighthouses. Bugs Publishing, 2006. ; . The Ultimate Guide to Upper Michigan Lighthouses. Bugs Publishing, 2007. . The Ultimate Guide to West Michigan Lighthouses. Bugs Publishing, 2005. . Sapulski, Wayne S., (2001) Lighthouses of Lake Michigan: Past and Present (Paperback) (Fowlerville: Wilderness Adventure Books) ; . Splake, T. Kilgore. Superior Land Lights. Battle Creek, MI: Angst Productions, 1984.

Wagner, John L. "Beacons Shining in the Night: The Lighthouses of Michigan". Clarke Historical Library, Central Michigan University. Wagner, John L., Michigan Lighthouses: An Aerial Photographic Perspective, (East Lansing, Michigan: John L. Wagner, 1998) . Wargin, Ed, Legends of Light: A Michigan Lighthouse Portfolio. Ann Arbor Media Group, 2006. . Wobser, David, Lighthouses of the Great Lakes , boatnerd.com. Wright, Larry and Wright, Patricia, Great Lakes Lighthouses Encyclopedia Boston Mills Press, 2006. .

External links

Interactive map of lighthouses in area by LighthousesRus Map of Michigan Lighthouses from Michigan.gov Michigan lighthouse conservancy, Gravelly Shoal Light National Buoy Data Center with automatic readout of wind, waves and weather for Gravelly Shoal Light. Photograph of Coast Guard boat at Gravelly Shoal, circa 1942, Archives of Michigan. Photos of Gravelly Shoal Light (current) from ferry