SULLIVANS ISLAND, S.C. (AP) — The last major lighthouse built in the United States is showing its age at 50, but the National Park Service is reviewing a management plan to maintain the beacon that still shines 27 miles out into the Atlantic Ocean on clear nights.

The black and white Charleston Light rising 140 feet above this affluent beach community on the northeast side of Charleston Harbor was commissioned in 1962.

It's unique among the hundreds of lighthouses in the nation in that its tower is triangular, the better to withstand hurricane winds that periodically pound the coast. And instead of walking up the tower on a spiral staircase, the lantern room can be reached by elevator.

Designed by Jack Graham, who studied under noted American architect Louis Kahn at the University of Pennsylvania, the light was the second-brightest in the Western Hemisphere when it was commissioned with 26 million candlepower. That proved much too bright for the locals, and the Coast Guard reduced the light to 1.5 million candlepower.

Also, island residents didn't care for the lighthouse's original red-orange color — like that on Coast Guard helicopters. So tower was painted black and white.

Charleston Light, known locally as the Sullivans Island lighthouse, replaced what is now the Morris Island lighthouse. Because of erosion, the Morris Island lighthouse is washed by the sea in an area that used to be high ground on the other side of Charleston Harbor.

People are always attracted to lighthouses, said Rick Dorrance, the chief of resource management at the Fort Sumter National Monument.

"They are beautiful and they are associated with the water, and people love the water. It's an unusual structure, and people know there aren't many of them in the United States," he said.

There are about 600 lighthouses in the nation, according to the Wisconsin-based United States Lighthouse Society.

The Fort Sumter National Monument includes the fort in the harbor where the Civil War began, the Charles Pinckney Historic Site in nearby Mount Pleasant, as well as Fort Moultrie and the U.S. Coast Guard Historic District on Sullivans Island.

The Park Service acquired the lighthouse and adjoining Coast Guard buildings in 2008 under the National Historic Lighthouse Preservation Act, Dorrance said. The Coast Guard put the lighthouse on its surplus property list with lighthouses becoming obsolete in an era of global positioning system navigation. Continued...