Field file · Lake & sea monster · Folklore
Swan Valley Monster
Also known as Snake River Monster
A twelve-legged, horned river monster said to have been shot by an old-timer at Olds Ferry on the Snake River in August 1868.
The Swan Valley Monster is a tall-tale river creature from eastern Idaho. It is said to have appeared on August 22, 1868, at Olds Ferry on the Snake River, in what is now Swan Valley, Bonneville County. An unnamed old-timer crossing the river supposedly saw an oddly assembled animal about twenty feet long, with a snake-like head the size of a washtub, a single horn, long fangs, a forked tongue and fins and spines, and twelve legs ending in a mix of hooves and claws.
The story goes that he shot it in the eye and went for help, but when he returned the creature was gone. The tale is retold in Idaho newspaper features and folklore websites, and Wikipedia’s entry on the town mentions it in a single line, citing an 1868 account.
The date is worth noticing: 1868 is also the year Joseph C. Rich published his famous reports of the Bear Lake Monster across the Utah border, later said to have been invented. No primary newspaper account of the Swan Valley sighting has been found, so it is best read as a piece of regional folklore or a humorous cousin of the Bear Lake story rather than a documented report.
What witnesses describe
A roughly twenty-foot hybrid beast with a horned, snake-like head, ten-inch fangs, fins, spines and twelve legs of mixed hooves and claws.
Where and when it’s seen
The Snake River crossing near Swan Valley and perhaps nearby Swan Lake in eastern Idaho.
Notable sightings
- August 22, 1868The old-timer at Olds Ferry Snake River, Swan Valley, Idaho
According to the tale, an unnamed old-timer saw and shot a strange river monster; no contemporary account has been identified.
What could explain it?
- The description is so fantastical, a mix of animals, that it reads as a tall tale rather than a witness report.
- It may have been inspired by the 1868 Bear Lake Monster reports, which Joseph Rich later admitted to be exaggerated or invented.
- Large fish, otters, drifting logs and river waves can be mistaken for monsters on big rivers.
Legend, culture and tourism
The monster is a minor piece of eastern Idaho lore, mentioned in local news features about the region’s creatures and in lake-monster collections, and is overshadowed by Sharlie and the Bear Lake Monster.
Places to visit
A famous trout fishery and scenic canyon, near the site of the old ferry crossing.
Where it’s reported
Sources
First published · Updated
