FIELD FILE · MINIWASHITULAKE & SEA MONSTERFOLKLORE
Miniwashitu
Also known as Missouri River monster
A one-eyed, red-haired river being said to break the Missouri River’s ice each spring, recorded in North Dakota by ethnobotanist Melvin Gilmore in 1921.
The Miniwashitu is a water being of the Missouri River, known from a tradition of the Indigenous peoples of the northern plains and first written down in North Dakota in the early 20th century. It is not a cryptid in the modern sense of a hidden animal waiting to be discovered, but a powerful presence tied to the river and the turning of the seasons.
Its best-known description comes from Melvin Randolph Gilmore, an ethnobotanist and authority on Plains peoples who served as curator of the State Historical Society of North Dakota from 1916 to 1923. Writing in 1921, Gilmore recounted what an Indigenous informant had told him: the being was like a great buffalo, covered in long red hair, with a single eye in the middle of its forehead and a single horn above it, and a backbone of jagged spines like the teeth of a saw. Later writers variously connect the tradition to the Mandan or Dakota, and the original account should be read with that uncertainty in mind.
In the story, the Miniwashitu travels up the Missouri each spring with a tremendous roar, glowing red and moving against the current, its spiny back slicing apart the river ice – so that the breakup of the ice, a dangerous and vital moment for river communities, is its doing. To see it in daylight was said to bring madness and blindness: Gilmore’s informant told of a man who had seen it not many years before, who lost his mind and died soon after reaching home.
The Miniwashitu has found a new audience through North Dakota news features and cryptid writing, but its meaning lies in the relationship between plains peoples and the Missouri – a river whose spring ice jams and floods could be as terrifying as any monster.
- Status
- Folklore
- First reported
- 1921
- Best-known location
- Missouri River, North Dakota
- Also called
- Missouri River monster
- Reported in
- North Dakota
What witnesses describe
A buffalo-like being standing taller than a man, covered with long red hair, with a single eye in the center of its forehead, one horn above the eye, and a saw-toothed ridge of spines along its back. It glows red and travels with a roaring sound. Some modern retellings add human-like hands and cloven hooves.
Where and when it’s seen
The Missouri River in North Dakota, appearing at the spring ice breakup as it moves upstream against the current.
Notable sightings
- 1921Gilmore records the tradition North Dakota
Museum curator and ethnobotanist Melvin R. Gilmore published an account of the Miniwashitu given to him by an Indigenous informant, including the story of a man who saw it and died soon afterward.
What could explain it?
- The Miniwashitu is best understood as part of an Indigenous body of knowledge about the river, not as a report of an unknown animal; treating it as a cryptid strips it of context.
- The roaring, grinding breakup of Missouri River ice each spring – with ice sometimes several feet thick – is a natural event of great power and danger that the story vividly embodies.
- The red glow and reddened water described in the story may reflect sunrise or sunset light on churning ice, or sediment stirred up by the spring flood.
- Modern descriptions have been embellished by internet retellings and AI-generated illustrations that have no basis in the original account.
Legend, culture and tourism
The story survives through Gilmore’s writings and through the traditions of the plains nations along the Missouri, including the Mandan, Hidatsa, Arikara and Dakota/Lakota peoples. It has recently been featured in North Dakota media and regional folklore writing, sometimes with sensational framing that should be weighed against the original Indigenous context.
Places to visit
The state museum, successor to the institution Gilmore once curated, with galleries on the Indigenous peoples of the Missouri River.
Where it’s reported
Miniwashitu in the news
No recent headlines about the Miniwashitu. Our news desk checks every day — see all cryptid news.
Sources
First published · Updated
