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Sharks in the Potomac River: Bull Sharks and the 1911 Scare

In 1911, Alexandria’s rivermen swore a 20-foot shark was climbing into their boats. The real Potomac shark is smaller, and it is a bull.

Posted Updated 8 min read
· 8 min· Episode Oct 23, 2026FollowOther apps

Here is a sentence I never expected to write about the Potomac River. In the summer of 1911, the fishermen of Alexandria were so rattled by sharks that they founded the Society for the Suppression of Man-Eating Fish.

I dug up the whole thing in the Washington Post from July 26th, 1911. The dispatch is datelined Alexandria, July 22, and it is a beauty.

A society to suppress man-eating fish

Alexandria, Va., July 22.–Savage sharks, which have attempted to climb on board small boats and drag occupants into the water, have created widespread excitement among the rivermen of this city, and are responsible for the organization of the “society for the suppression of man-eating fish,” of which Capt. Henry Simmons is president.

According to Capt. Simmons, who had an encounter with one of the fish, the sharks are desperate, hardened, and totally without fear of human beings. They are not even scared of motorboats, he declares.

“Something must be done,” said Capt. Simmons last night, “before it is too late. Positive measures must be resorted to if these sharks are to be shown where they get off. We cannot afford to have our leading citizens attacked. As soon as I learn the best way of killing a shark, I shall lead a party that will exterminate them; yes, suh, exterminate them.”

I would wear a “Society for the Suppression of Man-Eating Fish” t-shirt to the office tomorrow.

Notice what the article actually claims, though. It’s not a city shut down or a closed waterfront, just “widespread excitement among the rivermen.” That is the honest ceiling on the 1911 story, no matter how the headline writers have dressed it up since.

Then comes the encounter that started it all.

Capt. Simmons’ adventure occurred about 30 miles below here, last Wednesday. He was moving along in his gasoline boat, when, in the distance, he beheld a man in a batteau, who seemed to be earnestly punching something. As Capt. Simmons drew nearer, his horrified eyes discerned a giant shark–a creature between 15 and 20 feet long–which was determinedly trying to climb into the small craft.

While he hurried to the batteau man’s assistance, the fish made a vicious leap, and almost got over the gunwale. The man punched the shark on the nose, and it fell into the water.

And the shark came back. Here is how Capt. Simmons told the rest of it.

“I picked up a chunk of iron and cautiously went alongside. As I did, the enraged shark came to the surface, and, with gleaming eyes, again rushed toward the batteau. His mouth was open, and I could see his interior works as he lashed himself against the side of the batteau. Just as he poised himself for a spring, I struck. I hit him fairly behind the ears, and, with a roar, he disappeared under the water and made away, leaving a trail of foam behind him.”

Returning to Alexandria, the captain spread the news, and, within a short time, plans were arranged for a shark hunt. Several other residents claim to have seen these creatures in the river. The “society for the suppression of man-eating fish” was formed late yesterday afternoon, and comprises the leading fishermen of this community.

That’s a creature between 15 and 20 feet, climbing into a rowboat. Treat that the way you would treat any story told at a dock after a long day. No shark that size has any business in the Potomac, and a fish punched on the nose into retreat is folklore, not a field report.

The Post wasn’t first, either. The Alexandria Gazette ran the story on July 21st, 1911, two days after the encounter, under the headline “Sharks in the Potomac.”

Its version is plainer. “Captain Henry Simmons, of this city,” saw a man in a batteau fighting something in the water near Cockpit Point, “about thirty miles below Alexandria.” The shark’s head kept appearing over the side, nearly capsizing the boat, until it “finally retreated.”

The Gazette’s version has no size, no iron bar and no society. Three days later the Gazette was crediting the tale to “an old waterman.” Somewhere between the Gazette and the Post, the fish grew to 20 feet.

Watson and the Shark, John Singleton Copley's 1778 painting of a shark attacking a man beside a rowboat
“Watson and the Shark,” John Singleton Copley, 1778. The kind of scene Alexandria’s rivermen had in their heads. The National Gallery of Art’s version hangs in Washington. (National Gallery of Art, via Wikimedia Commons)

Could a shark really swim up the Potomac?

Here is the part that turns a fish tale into something worth your time. Strip away the exaggeration and the answer is yes. A shark can absolutely be off Alexandria, and we even know which one.

It is the bull shark, Carcharhinus leucas, and it cheats. Most sharks die in fresh water. The bull shark does not. It is euryhaline, which means it can move between salt and fresh by adjusting how much salt its kidneys, gills, and rectal gland hold and dump.

That trick takes the species places no shark should be. Bull sharks have turned up as far up the Mississippi as Illinois and they live in Nicaragua’s freshwater Lake Nicaragua. The Potomac is a gentle commute by comparison.

The Smithsonian Environmental Research Center, based on the Bay at Edgewater, studies five shark species in the Chesapeake: bull, blacktip, dusky, spinner, and smooth dogfish. Bull sharks are the ones with a taste for the rivers.

The state agency that counts them is not impressed by the drama either. Carrie Kennedy, who manages the coastal fisheries program at the Maryland Department of Natural Resources, estimated in 2013 that about 10 bull sharks are caught in Chesapeake waters in an average year. As the salinity climbs in late summer, they nose into the Potomac and other rivers after food.

“I don’t really find this to be particularly unusual,” Kennedy said in 2013, after a pair of them came out of a net near the river’s mouth.

One more thing about size. A grown bull shark runs about 7 to 11.5 feet and 200 to 500 pounds. That’s big enough to ruin your afternoon, but nowhere near Capt. Simmons’ 15-to-20-foot leviathan.

A death on the St. Mary’s in 1640

The real surprise is that the Potomac’s shark story does not start in 1911. It starts almost three centuries earlier, with a death, and it is one of the better-documented historical shark attacks anywhere in North America.

In the summer of 1640, a laborer in the young Maryland colony waded into the St. Mary’s River to cool off. The St. Mary’s is a Potomac tributary, a few miles upstream from where the river meets the Chesapeake. He did not get far.

The man who wrote it down was Father Thomas Copley, a Jesuit priest stationed at the St. Mary’s settlement, in his annual report to Rome. In Copley’s telling the swimmer was a would-be convert who had turned on the Church, grinding his rosary beads into powder and smoking them, and the priest clearly read what happened next as a verdict from above.

Scarcely had he touched the water when a huge fish having suddenly seized the wicked man, before he could retreat to the bank, tore away at a bite, a large portion of his thigh, by the pain of which most merited laceration, the unhappy wretch was in a short time hurried away from the living.

The account nearly slipped by. Kent Mountford, a former federal marine scientist, gave it a brief mention in a 2010 history column for the Bay Journal.

Years later, Richard Fernicola found that column online. He’s a New Jersey physician and the author of Twelve Days of Terror, a book on the 1916 Jersey Shore attacks. The two of them ran the story down together.

Their claim is bold. They argue the 1640 St. Mary’s death is the earliest documented fatal shark attack in North America, predating by two years a 1642 attack off what is now New York City that was probably invented by Washington Irving in 1809.

They are confident about the culprit, too. “We’re almost guaranteeing that this is the shark that killed this man,” Mountford said, naming the bull shark. Charles Bangley, a shark scientist who has studied the Bay for the Smithsonian, told the Bay Journal their work found that “the lower Potomac River in the general St. Mary’s area was a bit of a hot spot for sightings.”

Mountford and Fernicola did not stop at one death. They combed the historical record and counted 181 shark encounters in the Chesapeake region over the centuries, as many as seven of them fatal.

The panic that came five years later

If you know one American shark story, it is probably 1916. Between July 1 and 12 of that year, sharks killed four people along the New Jersey shore and badly injured a fifth, a 14-year-old boy who survived. The attacks ran from Beach Haven up to a creek in Matawan, miles from the open ocean, and they lit a national panic that later helped inspire Peter Benchley’s Jaws.

Here is the part the old Ghosts of DC headline got backwards. The 1916 panic could not have caused the 1911 Alexandria scare, because Alexandria’s rivermen were already founding their man-eating-fish society five years before New Jersey’s beaches emptied.

The little Potomac scare came first, and it was a local rehearsal for the hysteria the whole country would feel later.

Michael Schleisser with the shark caught in Raritan Bay during the 1916 Jersey Shore attacks
Michael Schleisser with the shark caught in Raritan Bay in 1916, suspected in the Jersey Shore attacks that gripped the nation. (Bronx Home News, 1916, via Wikimedia Commons)

Sharks in the Potomac today

The proof keeps showing up in fishermen’s nets. In August 2013, a St. Mary’s County waterman named John “Willy” Dean pulled two bull sharks out of his pound net near Point Lookout, right where the Potomac empties into the Bay. Each weighed about 220 pounds, one measured 8 feet, and they came up roughly 200 yards from a popular swimming spot.

Two years later it happened again. In September 2015, Robert T. Brown, president of the Maryland Watermen’s Association, found an 8-foot bull shark dead in a pound net near Breton Bay, off Medley’s Neck below Leonardtown. By then, according to a Patuxent River Naval Air Station official, five bull sharks had been caught in the Potomac in five years.

And yet, as Live Science reported in 2015, there had never been a reported shark attack in the Chesapeake Bay or the Potomac, not one. Generations of Washingtonians swam in the region’s tidal waters without losing so much as a toe. When the Potomac has turned genuinely deadly, it has been the current and the cold, not the teeth.

So the rivermen of 1911 were not crazy. They met a real animal and reached for the wrong size and the wrong name. The Potomac has had its shark all along. It just answers to bull, not great white.

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