USS Conestoga did not vanish in the middle of the Pacific. She did not reach Hawai‘i, and she never came close to American Samoa. The Navy fleet tug disappeared within a day of leaving San Francisco Bay—and went down only three miles from a lighthouse.
For 95 years, nobody knew that. Fifty-six sailors were gone, an enormous search looked in the wrong ocean, and the ship became one of the U.S. Navy’s last great unsolved disappearances. The answer was waiting beneath cold water off the Farallon Islands, close enough to make the ending hurt.
A Working Tug Bound for a Distant Station
Conestoga began life as a commercial ocean-going tug. Built by Maryland Steel at Sparrows Point for the Philadelphia and Reading Railroad Company, she was launched in November 1903 and delivered in February 1904. Her first trade was hard, unglamorous work: hauling coal barges along the Atlantic coast.
The Navy purchased her in September 1917 after the United States entered World War I. Assigned to the Submarine Force, she towed along the Atlantic seaboard, moved supplies and guns, escorted convoys to Bermuda and the Azores, and helped disabled vessels from Naval Base No. 13 in the Azores. In 1920 she received the classification AT-54, marking her as a fleet tug.
Her next orders were far from the Atlantic. Conestoga was to become a station ship at Tutuila, American Samoa. After fitting out at Norfolk, she crossed through the Panama Canal and worked her way north to California. Voyage repairs at Mare Island were the last preparation before the long Pacific run.
On March 25, 1921, Lieutenant Ernest Larkin Jones took Conestoga and her 56-man company out of Mare Island. Their immediate destination was Pearl Harbor, where the tug was expected on April 5. From there, they would continue toward Samoa.
No message ever arrived.
The Search Followed a False Trail
When the tug failed to appear, the Navy mounted a massive sea-and-air search. Ships and aircraft swept waters near Hawai‘i and along the Mexican coast. A lifeboat bearing the letter “C,” found drifting southwest of Mexico in May, seemed to support the belief that Conestoga had traveled far beyond California before disaster struck.
The search became the largest of its kind until the hunt for Amelia Earhart in 1937. Still, it found no confirmed wreckage and no survivors. On June 30, 1921, the Navy declared Conestoga lost with all 56 aboard.
Families were left with a blank space instead of a final position. Sailors know how much that matters. A latitude and longitude cannot undo a loss, but they tell you where a watch ended. For the families of Conestoga, even that small certainty was missing.
The Mystery Tug Beneath the Sanctuary
In 2009, a sonar survey recorded an unknown target in Greater Farallones National Marine Sanctuary off San Francisco. It was one more shape on the seabed until NOAA’s Maritime Heritage Program returned in September 2014. Archaeologists sent a remotely operated vehicle down and found a 170-foot steel-hulled, steam-powered ocean-going tug from the right era.
The problem was that the wreck did not match any tug known to have sunk in the sanctuary. Researchers widened the question: what tug had left the Golden Gate and never been seen again?
The dimensions fit Conestoga. So did the steam engine, boilers, portholes, mooring bitts, ventilators, towing winch, and four-bladed propeller. The decisive clue appeared almost casually in hours of underwater video—a single 3-inch/50-caliber naval gun matching photographs of the weapon mounted forward of Conestoga’s pilothouse.
A follow-up NOAA and Navy expedition in October 2015 confirmed the identification. On March 23, 2016, 95 years after the tug sailed, the Navy and NOAA announced that USS Conestoga had been found.
Three Miles from Safety
The wreck’s position rewrote the final voyage. Conestoga rests about three miles off Southeast Farallon Island, not thousands of miles away near Hawai‘i. Weather records show that choppy conditions outside the Golden Gate built into a gale on March 25, with winds reaching about 40 miles per hour and high seas hammering the coast.
NOAA’s investigation offers a careful reconstruction, not a witnessed account. The tug may have lost a tow in the gale; twisted wire on the wreck’s towing winch suggests trouble, while the secured wire indicates the crew handled it professionally. The older vessel had also been described as “wet,” meaning she was prone to taking water over her decks.
Researchers believe heavy seas, possible leakage, and water washing aboard may have forced Jones to abandon the westward passage and seek shelter at the Farallones. The island had a lighthouse, a naval radio station, and a protected landing at Fisherman’s Cove. The wreck points north-northwest, consistent with a ship trying to reach the island’s lee.
They almost made it. NOAA concludes that Conestoga most likely sank on the morning of March 26, taking every man aboard. The lighthouse that might have guided them to shelter was only three miles away.
A Grave, a Habitat, and a Final Position
The wreck remains property of the U.S. Navy and a military grave protected by federal law. White plume anemones now cover parts of the hull, while wolf eels, lingcod, and rockfish shelter around the machinery. Life has gathered on a vessel that once carried 56 men toward a new duty station.
The discovery did not reveal every minute of Conestoga’s last watch, and responsible history should not pretend otherwise. What it did provide was a location, a likely sequence of events, and proof that the crew fought their casualty close to home—not somewhere beyond the horizon where the search had gone.
Like the open-boat ordeal after the wreck of USS Saginaw and the rediscovery of U-166 beneath the Gulf, the Conestoga story reminds us that the sea can keep a secret far longer than any sailor expects. It also shows what patient chart work, archival research, and underwater technology can return to the record.
For more stories and designs shaped by working-water heritage, visit the Fair Winds Coast Guard & Navy collection.
The Last Watch Is No Longer Lost
A sailor’s final position matters. Ninety-five years after Conestoga disappeared, her crew finally had one: three miles off Southeast Farallon Island, bow turned toward shelter. The mystery ended there, but the watch of 56 sailors deserves to keep being remembered.