A foghorn or fog signal is a device that uses sound to warn vehicles of navigational hazards such as rocky coastlines, or boats of the presence of other vessels, in foggy conditions. The term is most often used in relation to marine transport. When visual navigation aids such as lighthouses are obscured, foghorns provide an audible warning of rock outcrops, shoals, headlands, or other dangers to shipping.
The Point Wilson Light is an active aid to navigation located in Fort Worden State Park near Port Townsend, Jefferson County, Washington. It is one of the most important navigational aids in the state, overlooking the entrance to Admiralty Inlet, the waterway connecting the Strait of Juan de Fuca and Puget Sound. The lighthouse was listed on the Washington State Heritage Register and the National Register of Historic Places in 1971.
Trevose Head Lighthouse is a lighthouse on Trevose Head on the north Cornish coast at grid reference SW850766 lying to the WSW of Padstow and was sited here as there was previously no light from Land's End to Lundy and it would be visible from Cape Cornwall to Hartland Point.
The original Point Loma Lighthouse is a historic lighthouse located on the Point Loma peninsula at the mouth of San Diego Bay in San Diego, California. It is situated in the Cabrillo National Monument. It is no longer in operation as a lighthouse but is open to the public as a museum. It is sometimes erroneously called the "Old Spanish Lighthouse", but in fact it was not built during San Diego's Spanish or Mexican eras; it was built in 1855 by the United States government after California's admission as a state.
Destruction Island Lighthouse is a decommissioned lighthouse on Destruction Island, a rocky island that is part of the Quillayute Needles National Wildlife Refuge lying about 3 miles (4.8 km) off the coast of Jefferson County, Washington, in the northwest of the United States.
The Burrows Island Light is a lighthouse on the western tip of Burrows Island, facing Rosario Strait, near Anacortes, in Skagit County, Washington.
The Cape Flattery Light is a historic lighthouse structure located at the entrance to the Strait of Juan de Fuca near Neah Bay, Clallam County, in the U.S. state of Washington, within the Makah Indian Reservation. The deactivated lighthouse sits on Tatoosh Island, which is named after Chief Tatooche of the Makah Tribe. It is the northwesternmost lighthouse on the West Coast of the contiguous United States. Although closed to the public, it can be viewed from Cape Flattery via a short 30-minute walk.
Cattle Point Lighthouse is a lighthouse on the southeastern tip of San Juan Island overlooking the Strait of Juan de Fuca where the Haro Straits meet the San Juan Channel, in San Juan County, Washington. The light lies adjacent to the state's Cattle Point Natural Resources Conservation Area and, since 2013, is part of the San Juan Islands National Monument.
The Lime Kiln Light is a functioning navigational aid located on Lime Kiln Point overlooking Dead Man's Bay on the western side of San Juan Island, San Juan County, Washington, in the United States. It guides ships through the Haro Straits and is part of Lime Kiln Point State Park, which offers tours during summer months.
The Marrowstone Point Light is an active navigational aid overlooking Admiralty Inlet at the northern tip of Marrowstone Island, Jefferson County, Washington, in the United States. It lies adjacent to but is not part of Fort Flagler State Park; it may be viewed from the park's beach but is not open to the public.
Patos Island Lighthouse is an active aid to navigation overlooking the Strait of Georgia at Alden Point on the western tip of Patos Island in the San Juan Islands, San Juan County, Washington, in the United States. The station is the northernmost in the San Juan Islands and marks the division point between the eastern and western passages into the Strait of Juan de Fuca.
Point No Point Light is an operational aid to navigation on the northeastern tip of the Kitsap Peninsula on the west side of Puget Sound, at Point No Point where Admiralty Inlet joins Puget Sound, near the small community of Hansville, Kitsap County, in the U.S. state of Washington. Point No Point Light is considered the oldest lighthouse on Puget Sound and is listed on the National Register of Historic Places.
The Point Robinson Light is an operational aid to navigation and historic lighthouse on Puget Sound, located at Point Robinson, the easternmost point of Maury Island, King County, in the U.S. state of Washington. The site was listed on the National Register of Historic Places in 2004.
Alcatraz Island Lighthouse is a lighthouse—the first one built on the U.S. West Coast—located on Alcatraz Island in California's San Francisco Bay. It is located at the southern end of the island near the entrance to the prison. The first light house on the island was completed in 1854, and served the bay during its time as a Citadel and military prison. It was replaced by a taller concrete tower built in 1909 to the south of the original one which was demolished after it was damaged due to earthquake in 1906. The automation of the lighthouse with a modern beacon took place in 1963, the year Alcatraz closed as the Alcatraz Federal Penitentiary. It is the oldest light station on the island with a modern beacon and is part of the museum on the island. Although when viewed from afar it easily looks the tallest structure on Alcatraz, it is actually shorter than the Alcatraz Water Tower, but as it lies on higher ground it looks much taller.
Ballast Point Lighthouse was a lighthouse in California, situated on Ballast Point, a tiny peninsula extending into San Diego Bay from Point Loma, San Diego, California. The lighthouse was torn down in 1960; the site is now on the grounds of Naval Base Point Loma. Ballast Point Lighthouse was the last lighthouse displaying a fixed light on the Pacific Coast. An automated light is left in its place and operates on a piling in the water off of the original site.
A Daboll trumpet is an air trumpet foghorn which was developed by an American, Celadon Leeds Daboll, of New London, Connecticut. It was basically a small coal-fired hot air engine, which compressed air in a cylinder on top of which was a reed horn.
Point Sur Lighthouse is a lightstation at Point Sur 24.6 miles (39.6 km) south of Monterey, California at the peak of the 361-foot (110 m) rock at the head of the point. It was established in 1889 and is part of Point Sur State Historic Park. The light house is 40 feet (12 m) tall and 270 feet (82 m) above sea level. As of 2016, and for the foreseeable future the light is still in operation as an essential aid to navigation. Point Sur is the only complete turn-of-the-20th-century lightstation open to the public in California. Three-hour walking tours guided by volunteers are available on Wednesdays and weekends throughout the year.
The Cuckolds Light, known as the Cuckolds Island Fog Signal and Light Station or just Cuckolds Light Station, is a lighthouse located on the eastern pair of islets known as the "Cuckolds" in Lincoln County, Maine. The islets are southeast and in sight of Cape Island, that is just off the southern tip of Cape Newagen on Southport Island, south of Booth Bay, that leads to Boothbay Harbor, Maine.
The Manana Island Sound Signal Station is an active fog signal station on Manana Island, Maine, United States. Established in 1855, it is one of the only separately managed fog signals in the United States, having been operationally independent of Monhegan Island Light for most of its existence. It is also home to the only known fog signal trumpet tower, built in 1889. The station was listed on the National Register of Historic Places as Manana Island Fog Signal Station in 2002.
Dungeness Lighthouse on the Dungeness Headland started operation on 20 November 1961. Its construction was prompted by the building of Dungeness nuclear power station, which obscured the light of its predecessor which, though decommissioned, remains standing. The new lighthouse is constructed of precast concrete rings; its pattern of black and white bands is impregnated into the concrete. It remains in use today, monitored and controlled from the Trinity House Operations and Planning Centre at Harwich, Essex.
