Monster Monday: The Flathead Lake Monster

In 1889, the year Montana became a state, a steamboat called the U.S. Grant was working its way down Flathead Lake with something over a hundred passengers aboard. Her captain, James C. Kerr, saw a log in the water ahead.

Then the log started moving.

What Kerr and his passengers reported was an object of perhaps twenty feet, whale-like, coming towards the boat. One passenger — and here the nineteenth century announces itself — produced a rifle and fired at it. The thing went down. Everybody got home. And the Flathead Lake Monster, in the form we still argue about, was born on that afternoon.

It has been argued about ever since. More than a hundred sightings have been logged in the years since Kerr, most of them between April and September, which is either evidence of a creature’s seasonal habits or evidence of when people are on the water with a drink in their hand. Locals call it Flessie, in tribute to a more famous Scottish resident. Two explanations dominate: a sturgeon, or a giant eel.

Both of those explanations are worth taking seriously. Neither of them, it turns out, came from the lake.

The lake’s case for itself

Flathead is not a pond. It covers close to two hundred square miles, runs to a maximum depth of 370 feet, and is the largest natural freshwater lake west of the Mississippi. Tom Bansak of the Flathead Lake Biological Station describes it as a geological remnant of Glacial Lake Missoula, that vast ice-dammed body whose repeated collapses scoured the Pacific Northwest.

So the concealment argument has legs. There is genuinely a great deal of cold, dark water here, and a fish with any sense would spend most of its life at the bottom of it.

The sturgeon, taken seriously

The white sturgeon is the largest freshwater fish in North America, can live the better part of a century, and looks — with its ridged back and long tapering snout — convincingly prehistoric. It is not a mad suggestion. Flathead drains into the Clark Fork, the Clark Fork into the Pend Oreille, and onwards into the Columbia system, so we are at least in the right plumbing.

Bansak is admirably straight about it: he thinks it highly likely that sturgeon lived in Flathead Lake or its predecessors, and says the real question is whether they persist and whether anyone can prove it. That is the honest scientific position, which I have little ability or interest in discrediting.

The difficulty is everything after that. The nearest white sturgeon are in a different drainage — the Kootenai River below Kootenai Falls, and Kootenay Lake up in British Columbia — and biologists cite waterfalls, and later dams, are precisely what fixed those limits. Flathead has been netted, electro-shocked, and visited by small submarines. Nothing out of the ordinary or monstrous has been officially recorded. Brian Marotz, then of Montana Fish, Wildlife and Parks, made the point that with a popular deep-water lake trout fishery operating year after year, somebody should long ago have pulled up at least a small or juvenile monster by accident.

And there is an arithmetic problem nobody likes to dwell on. The creature of the sighting record is thirty to forty feet long, undulates like a snake, and has black eyes. Even the most magnificent of sturgeons does not match that description.

The sturgeon, and where it actually came from

Here is the part that reframes the whole business.

In the 1950s, a group of Polson residents formed an organisation called Big Fish Unlimited. Its stated purpose was not zoological. It existed to generate publicity of the economically beneficial kind for the town at the south end of the lake. To that end it offered money: five hundred dollars for a sturgeon over nine feet, a thousand for one over fourteen.

Enter C. Leslie Griffith, aged sixty-three, described as a freelance fisherman, and who had reportedly taken a 300-pound white sturgeon out of Idaho’s Snake River. He moved to the lakeshore near Dayton and fished for the best part of three months. On a Friday evening in late May 1955, off Cromwell Island, something took his line and — by his account — towed his sixteen-foot cedar boat around the lake for five hours before he gaffed it.

The fish was seven feet six inches long and weighed 181 pounds. Within hours it was on ice in the Salish Hotel building and views could be had at twenty-five cents a look, ten cents for children, with a competition to guess its weight thrown in. Promotional posters billed it as “our baby monster”. Some seven thousand people came. The Great Falls Tribune put it on the front page under a headline about a fisherman hooking the Flathead Lake Monster, while noting, drily, that nobody had ever caught a sturgeon in that lake before or produced good evidence there were any. The Tribune also observed that the fish subsequently swelled to 350 pounds in newsprint.

When people began asking the obvious question — had it actually come out of the lake — the promoters responded with a masterpiece of logic. They offered a thousand dollars to anyone who could prove it hadn’t. Griffith and the group’s leading light both signed notarised statements swearing it had. Two university zoologists opened the fish up and found the situation no clearer, though one of them noted a fish backbone inside it that didn’t appear to belong to anything known to live in Flathead.

Then, as these things do, it went to law. Griffith sued over ownership and money. It took until late 1959 for the Montana Supreme Court to settle it, and the court offered no opinion whatsoever on where the fish had come from.

And the fish is not in the state records. Not then, not now.

That absence deserves emphasis, because it cannot be explained away as paperwork nobody filed. The official Montana record for white sturgeon is a 96-pound fish caught in the Kootenai River in 1968. Griffith’s was 181 pounds. Had it been accepted, it would have taken the state record by nearly double and held it comfortably for the next sixty years. Fish of that size do not slip quietly past the record-keepers.

To be scrupulous: record books have eligibility rules about method of capture, witnesses and certified scales, and a man who gaffs a fish alone after a five-hour fight may simply fall outside them. Absence from the books is not proof of fraud. But it is not an oversight either, and the state of Montana has now spent seventy years declining to write down the most famous fish ever taken from its most famous lake.

The sturgeon theory, in other words, does not rest on a fish. It rests on a bounty.

The eel, and the map

The eel is the other favourite, and it dies faster.

There are no freshwater eels in any Pacific drainage of North America. None. The American eel is an Atlantic animal that spawns in the Sargasso Sea, and there is no route from there to a lake in western Montana that does not involve a lorry, or truck in American parlance. The nearest eel-shaped candidate is the burbot — a freshwater cod, elongate, nocturnal, deep-dwelling — and even the burbot is native to the Kootenai drainage rather than the Flathead, turning up in the lower Clark Fork only as an introduction. Wrong system, wrong size, wrong animal.

Which tells us what “eel” is doing in these accounts. It isn’t a taxonomic proposal. It is a word people reach for when they have seen something long moving through water, because English does not offer them a better one. Well, other than monster.

The thing under the ice

Long before any of this, the Ktunaxa told a story about the lake.

In the version recorded by Ella E. Clark in Indian Legends from the Northern Rockies, the people once lived on an island in the middle of Flathead. Crossing the frozen lake one winter, two girls found antlers about two feet long standing up through the ice. Taking them for a dead animal’s, the girls set about cutting them free with sharp stones. The antlers began to shake. The ice split open, and a head came up through it. The girls escaped by transforming themselves, but half the people drowned — which is why, the story holds, there are so few Ktunaxa, and why afterwards they did not stray far from the shore.

Modern write-ups routinely cite this as proof that the monster has been seen for centuries. It is worth noticing how badly that fails.

The creature in the story is antlered. It is not a sturgeon and it is not an eel. And the story is not a sighting report — it explains why the world is as it is and warns against a particular kind of greed. Conscripting it as corroboration for Flessie is precisely the move Big Fish Unlimited made with the sturgeon: taking something that existed on its own terms and repurposing it as evidence for a claim it never made.

There is a further point, and it matters. Sturgeon fishing was part of Ktunaxa life in the Kootenay basin, where the fish genuinely occur. These were people who knew what a sturgeon was, caught them and ate them. When their tradition describes an antlered thing shaking apart the ice, it is not a confused account of a big fish. It is a different kind of statement about the world, and it earns the right to be read as one.

And no, it isn’t a wendigo

Some of you got to “antlered creature” and thought it. Or, at least I did. So, let’s deal with it, because the answer is more interesting than a connection would have been.

The wendigo belongs to Algonquian-speaking peoples of the Great Lakes and the subarctic — Cree, Ojibwe, Saulteaux, Innu. Flathead’s peoples are Salishan and Ktunaxa, the latter speaking an isolated language with no accepted relation to Algonquian or anything else. Different culture area, different language family, and a very great distance between them.

More to the point, the traditional wendigo has no antlers. It is a gaunt, ash-skinned figure with sunken eyes and a heart of ice, whose hunger grows with everything it eats, and its horror is that it still looks like a person. The antlered deer-skull creature is a twentieth-century invention, assembled out of horror fiction and finished off by video games and internet art.

So the wendigo acquired its antlers exactly the way Flessie acquired its sturgeon. Retrofitted from outside, by people telling the story for their own purposes, until the new version buried the old one. If like me you made that connection a moment ago, you weren’t making a mistake. You were demonstrating the thesis.

The trade in monsters

None of this was new in 1889, and Kerr’s generation had form.

In July 1855, fishermen on Silver Lake in western New York saw a floating log that turned out to move. The local paper reported it. More sightings followed. Visitors poured into the town of Perry, watchtowers went up, vigilance committees patrolled the water, and the Walker Hotel filled up well outside the season. In 1857 the hotel burned down, and in the wreckage somebody found a wire-and-canvas serpent with a set of bellows. The hotelier had built his monster on the bones of a Seneca story about a creature in the lake. Out-of-town papers had called it nonsense from the start, and had been right.

A log that turns out to move was, by 1889, very nearly a genre convention.

Nobody has found bellows in Flathead, and I am not accusing Captain Kerr of anything. But a lake steamer full of paying passengers in a brand-new state on the edge of a tourist boom is a particular kind of setting, and the local paper, the Flathead Courier at Polson, spent decades as the monster’s newspaper of record.

Its long-serving editor, Paul Fugleberg, kept an inventory of what sightings turned out to be. Wave action, shadows, odd light, logs. Bears, horses, deer, elk, and even dogs. There was also a dead monkey, an escaped buffalo, and a circus seal that had gotten loose. There is a whole social history of Montana in that list.

The part that should give us pause

It would be easy to finish there, and it would be too easy.

Fugleberg himself never dismissed the possibility outright. In 1962 the writer Dorothy M. Johnson, then secretary of the Montana Press Association, wrote to warn him against treating the reports with his tongue in his cheek: the witnesses had been frightened, and hadn’t found it funny. She added that she had heard of something in Flathead Lake forty years earlier, so the Polson Chamber of Commerce could not claim the credit.

Then there is Laney Hanzel, who worked the lake as a fisheries biologist for Montana Fish, Wildlife and Parks from 1960 until 1993 and became the closest thing the phenomenon had to a scholar. He compiled the sightings, interviewed the witnesses, mapped them all. He disliked the word monster and refused to use it. He called it a creature, and by every account he told the stories in a way that left you genuinely unsure what he thought, and free to decide for yourself.

Thirty years on the water, night and day, and Hanzel never saw a thing himself.

What is actually in the lake

In truth? Probably nothing out of place. A very large lake trout, a floating log at the wrong angle, an elk swimming a bay, a wind seam running across still water at dusk. The occasional person telling a story, and rather more people believing one.

But the more revealing question isn’t what’s down there. It’s what each generation put there. The Ktunaxa placed an antlered being beneath the ice and drew a hard warning from it. A steamboat captain in statehood year saw a whale. A chamber of commerce saw a sturgeon, and priced it at twenty-five cents a look. The twentieth century, once Loch Ness supplied the template, saw a long neck and an undulating body.

Flathead is 370 feet deep and takes three and a half years to change its water. It is very good at holding things. It just tends to give back exactly what was brought to it.

Monster Monday: The Mahamba

The Congo’s fifty-foot crocodile

Sometime in early 1888, a small government steamer was making four miles an hour up the Congo River when she ran aground. There’s nothing remarkable in that — Africa’s second longest river and the world’s deepest is a maze of shifting sandbanks, and any pilot expects to feel his hull kiss the bottom now and again. What was remarkable was that this sandbank began to heave. The water around the bow churned in a way no sandbank has any business doing, and the steamer’s engineer, leaning over to find the cause, watched the bank itself detach from the riverbed and bolt. It was a crocodile. One longer, he was certain, than his forty-two-foot boat, and it crossed the bar and tumbled into deep water before he could reach for a rifle. They had run the steamer clean into a living animal at speed, jammed it into the sand, and it had shrugged them off and left without a mark on it.

The engineer was John Reinhardt Werner, and the animal, if the Congo’s rivermen were to be believed, was the Mahamba.

A witness in the wrong century

Werner is an unusually good witness for a monster, which is precisely what makes him a problem. He was not a folklorist collecting tales around a fire, nor a Victorian showman selling a story. He was a working engineer keeping the boilers running on a colonial waterway, and he wrote his account up plainly in A Visit to Stanley’s Rear-Guard (Blackwood, 1889) as one observation among many practical ones. His steamer, the A.I.A., took her name from the Association Internationale Africaine — the “philanthropic” society, dedicated on paper to lighting the darkness of Africa and ending the slave trade, that served as Leopold II’s cover story while he assembled the private empire that would become one of the most murderous colonial regimes in history. I wanted to make that clear, because the romance of the Victorian riverboat curdles the moment you remember what the riverboat was for. Werner was part of the apparatus. His crocodile sightings come to us stamped with the flag of a project built on forced labour and mass death.

That grim provenance aside, Werner’s testimony is specific. He described these giant crocodiles as almost common on the river, and he did not hedge on size. On a low sand-spit beyond the grasses, he wrote, one might see a monster of perhaps fifty feet; he claimed to have seen several considerably longer than the A.I.A. On one occasion, stalking ducks across a sandbank with only a shotgun, he found the largest crocodile he had ever seen lying between him and his supper. Measuring it by eye against the steamer moored three hundred yards off, he reckoned it a full fifty feet long, with the ridged crest of its back standing four feet clear of the sand. He sent a boy for his rifle, thought better of the whole enterprise, and in retreating spooked the ducks — whereupon he took a shot at them, missed, and startled the crocodile into the water. It is a very funny, very human anecdote, and it has the ring of a man reporting exactly what he saw rather than embroidering a legend.

The scale problem

The Nile crocodile, the largest predator these waters officially hold, is a genuinely formidable animal that tops out at roughly twenty feet. A big saltwater crocodile — the largest living reptile on Earth — reaches perhaps twenty-one. Werner was describing something more than twice that length: a creature outside the entire range of any crocodile known to science, living or dead.

And that last phrase is where the Mahamba does something most cryptids cannot. It out-measures the fossil record.

The usual yardstick reached for here is Sarcosuchus imperator, the Cretaceous giant nicknamed the “SuperCroc.” When Paul Sereno’s team described it for a rapt public in 2001, the headline figure was around forty feet — a crocodile-shaped monster that shared the rivers of what is now Niger with dinosaurs and, on the strength of a five-and-a-half-foot skull, may occasionally have eaten them. Forty feet. Even by that generous early estimate, Werner’s fifty-foot animal is the larger beast.

But the comparison has sharpened since. A 2019 reassessment pulled Sarcosuchus back to a more conservative maximum of about thirty-one feet — and the other contenders for largest-ever crocodilian, Deinosuchus and the giant caiman Purussaurus, cluster in the same thirty-three-to-forty-foot bracket, all of them reconstructed from fragmentary bone. In other words, the best-supported estimate for the largest crocodyliforms that ever lived now sits comfortably below what Werner claimed to have watched sunbathing on a sandbar. The Mahamba is not merely bigger than any living crocodile. It is bigger than the biggest crocodile the earth has ever produced a fossil of.

That should give even a sympathetic and optimistic reader pause.

The second stream

The easy move would be to file Werner under Victorian exaggeration and close the book. What complicates that is a second, entirely independent line of testimony arriving nearly a century later.

In the 1980s the biologist Roy Mackal travelled the Congo basin chasing Mokele-mbembe, the region’s more famous “living dinosaur.” Along the way he collected the vocabulary the Bobangi people used for the animals of their river, and it was more precise than an outsider might expect. There was the ordinary crocodile. There was the Nguma-monene, a long, ridge-backed thing that was something else again. And then there was the Mahamba: not a separate kind of animal but a crocodile in every way that matters — same shape, same habits — only monstrously, impossibly large, forty to fifty feet and more, said to lie up in long tunnels dug into the riverbanks. The people describing it were not confusing it with anything. They were insisting, from direct familiarity with the real crocodiles all around them, that this was one of those and simply far too big.

So we have two witnesses who never met, separated by a hundred years and by every difference of language, purpose and worldview, describing the same specific impossibility in the same specific water. That is a genuinely uncomfortable coincidence, and it is the strongest thing the Mahamba has going for it.

What could it be?

The serious hypothesis is a relic: a surviving or simply undescribed giant crocodilian, a lineage that kept the old Cretaceous dimensions going in the vastness of the Congo swamps where no one has ever managed a proper survey. It is not absurd on its face — the region is enormous, poorly mapped, and has surrendered new large vertebrates within living memory.

The less serious end of the shelf holds the idea, which surfaces now and then in the cryptid literature, that the Mahamba is no crocodile at all but some freshwater relative of the mosasaurs. A 1954 sighting in the Maika marshes is sometimes pressed into service here — a large reptile that reportedly lifted an abnormally long neck from the water before diving. But that long neck pulls in the opposite direction from everything else on record; it describes a different animal from Werner’s flat-backed, short-legged, unmistakably crocodilian giant, and folding the two together muddies rather than strengthens the case.

Then there is the explanation that requires nothing new at all. A single, genuinely enormous Nile crocodile — an old, exceptional individual pushing the upper limit of its kind — glimpsed across open water, with no fixed reference for scale and a rifle conspicuously absent, is exactly the raw material from which fifty-foot estimates are honestly made. Water flatters length. Distance deceives. Fear does the rest. Werner measured his monster against a steamer three hundred yards away, and even a careful man measuring by eye across that gap can be handsomely wrong.

I remember being on the banks of the Chobe River in Botswana, and just happening to look up. At some distance – my estimation was not dissimilar to Werner’s three hundred yard steamer – I saw what I thought was a large tree floating in the centre of the river. It took me a few moments to realised it was of course, a huge crocodile. The size really threw me off and at that distance, I almost certainly over estimated it. But I did think it was every inch of twenty feet, if not more. And I made the comparison to what was in front of me – a tour boat.

So, I have some sympathy for anyone matching boat sizes to unusually large crocodilians. But I think we can accept it’s not an exact science.

Where are the bones?

Sarcosuchus skull at the Museum d’Histoire Naturelle. No children were harmed in the taking of this photo 🙂

Which brings us to the question that closes the file on the Mahamba, as it closes the file on most of its kind.

We know Sarcosuchus was real because it left us a skull the length of a man and enough skeleton to argue over. We know the outer limits of crocodilian size because the fossil record, patchy as it is, has physically produced the animals. The Mahamba has produced witnesses — good ones, independent ones, a century apart — and not one confirmed bone. No skull, no skeleton, no shed tooth the size of a hand, nothing hauled from a bank or found bleaching on a sandbar. For an animal supposedly common enough that a working engineer saw several in the course of doing his job, that absence is very loud.

Sarcosuchus outgrew the living world and left us its remains. The Mahamba outgrew even Sarcosuchus, and left us only the water it disappeared into.

Why Black Beast Books Exists

There are places where stories refuse to die.

Forests that remember what passed through them.
Landscapes shaped as much by fear and folklore as by history.
Animals that slip between fact and myth, never fully explained, never fully forgotten.

Black Beast Books exists in that space.

This blog, and the work behind it, has always been about the meeting point between wildlife, folklore, fear, and storytelling. About the creatures we fear, the ones we misunderstand, and the ones we invent to make sense of the world around us. Sometimes those creatures are real. Sometimes they’re not. Often, they’re something in between.

As I move into 2026, I wanted to pause — not to reinvent this space, but to recommit to it.

Going forward, Black Beast Books will be a home for regular, thoughtful writing and storytelling, built around a few recurring threads:

Long-form essays exploring beasts, monsters, and man-eaters
Reflections on horror, folklore, and creature cinema
Monthly deep dives into UK big cat sightings
Behind-the-scenes insight into research, writing, and place
Occasional updates on my novels — because these stories feed directly into the fiction I write

This isn’t about chasing trends or shouting into the void. It’s about building something slowly, consistently, and honestly, creating a body of work that grows over time, shaped by curiosity rather than urgency.

If you’re drawn to strange animals, half-remembered legends, the uneasy relationship between humans and the wild, or stories that linger longer than they should — you’re in the right place.

Thank you for being here.
The beasts aren’t going anywhere.