FIELD FILE · SLIDE-ROCK-BOLTEROTHERFOLKLORE
Slide-Rock Bolter
Also known as Macrostoma saxiperrumptus, Mountain Whale
A giant, whale-like beast that hooks its tail over Colorado ridges and toboggans down to swallow tourists – a tall tale from the 1910 Fearsome Creatures.
The Slide-Rock Bolter is one of the “fearsome critters” – the comic monsters of American lumber camps, mining towns and ranger stations, invented to tease greenhorns and pass long evenings. Its home is the steep high country of Colorado’s San Juan Mountains, and its prey of choice is the summer tourist.
The creature’s classic description comes from Fearsome Creatures of the Lumberwoods, with a Few Desert and Mountain Beasts, published in Washington, D.C., in 1910 by forester William T. Cox and illustrated by Coert DuBois, both men of the young U.S. Forest Service. Cox explains, with a straight face and a mock-scientific Latin name, that the bolter lives only on slopes steeper than 45 degrees. It has an enormous head, tiny eyes and a mouth like a sculpin’s that runs back past its ears, and its tail ends in a split flipper armed with giant grab-hooks.
The bolter hooks its tail over a ridge crest and waits motionless for days, watching the gulch below. When a tourist wanders in, it lets go, greases its own path with drool, and shoots down the mountainside like a toboggan, scooping up its victim and coasting up the opposite slope to hook on again. Cox claims whole parties of sightseers have been gulped at once, and that the swaths of flattened spruce on Colorado slopes are the bolter’s work.
The story ends with the most famous scene in fearsome-critter lore. A forest ranger in the rough country between the Ophir peaks and Lizard Head, Cox writes, built a dummy tourist – plaid Norfolk jacket, knee breeches, guidebook to Colorado and all – stuffed it with dynamite and blasting caps, and set it out as bait. A bolter took it, and the explosion flattened half of Rico. The real Rico, a small former silver-mining town in Dolores County, remains a few miles from Lizard Head Pass.
- Type
- Other
- Status
- Folklore
- First reported
- 1910
- Best-known location
- San Juan Mountains near Rico and Lizard Head, Colorado
- Also called
- Macrostoma saxiperrumptus, Mountain Whale
- Reported in
- Colorado
What witnesses describe
A huge, whale- or fish-like animal with a massive head, very small eyes, an enormous sculpin-like mouth reaching behind its ears, and a tail split into a flipper with large hooks for gripping mountain ridges. It is said to drool a greasy slime that speeds its slide.
Where and when it’s seen
The steepest slopes and gulches of Colorado’s mountains – slopes over 45 degrees – especially the San Juan Mountains around Lizard Head, the Ophir area and Rico. It is said to hunt in summer, when tourists arrive.
Notable sightings
- 1910Described in Fearsome Creatures of the Lumberwoods Washington, D.C.
William T. Cox’s illustrated catalog of lumberjack monsters introduced the slide-rock bolter, with its Latin name Macrostoma saxiperrumptus, alongside the hodag, squonk and other critters.
- Undated (in Cox’s tale)The ranger’s dummy tourist Lizard Head and Rico, Colorado
In Cox’s story, a ranger lures a bolter from Lizard Head with an explosive-filled dummy tourist; the blast supposedly flattened half the buildings in Rico, which were never rebuilt. It is a joke, not a historical event.
What could explain it?
- The bolter is a deliberate tall tale from the fearsome-critter tradition, created to amuse and to tease newcomers, not a report of a real animal.
- It neatly “explains” real mountain hazards – rockslides, avalanches and the long avalanche paths that strip spruce from Colorado slopes.
- The tourist-eating joke reflects early 20th-century foresters’ and locals’ wry view of the growing number of summer visitors to the Rockies.
Legend, culture and tourism
The slide-rock bolter is a favorite of Colorado folklore and modern cryptid fandom, appearing in books on fearsome critters, podcasts, art and merchandise. Cox’s 1910 book, in the public domain, is freely available online and has been recorded as a LibriVox audiobook.
Places to visit
The dramatic volcanic spire of Lizard Head, named in Cox’s tale, rises above the highway pass between Telluride and Rico.
The small historic mining town that, in the story, lost half its buildings to an exploding bolter.
Where it’s reported
Slide-Rock Bolter in the news
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Sources
First published · Updated
