Geologically, it’s a new area, where enormous forces are still thrusting up mountains, where volcanic craters still exist, and where the heat of the earth still spouts its imprisoned fury through the geysers that have made Yellowstone Park’s Firehole Basin famous.
At 11:37 P. M. on Monday, August 17, 1959, one of the severest earthquakes recorded on the North American continent shook this area. It sent gigantic tidal waves surging down the 7-mile length of Hebgen Lake, throwing an enormous quantity of water over the top of Hebgen Dam, the way you can slosh water out of a dishpan, still keeping it upright. This water—described as a wall 20 ft. high—swept down the narrow Madison Canyon, full of campers and vacationers who were staying in dude ranches and at three Forest Service campgrounds along the seven-mile stretch from the dam to the point where the canyon opened up into rolling wheat and grazing land. Just about the time this surge of water reached the mouth of the canyon, half of a 7,600-ft.-high mountain came crashing down into the valley and cascaded, like water, up the opposite canyon wall, hurtling house-size quartzite and dolomite boulders onto the lower portion of Rock Creek Campground.
This slide dammed the river and forced the surging water—carrying trees, mud, and debris, back into the campground. The campers who’d escaped being crushed under part of the 44 million cubic yards (80 million tons) of rock found themselves picked up and thrown against trees, cars, trailers, the side of the canyon, etc. Heavy, 4,000 pound cars were tossed 40 ft. and smashed against trees by the force of the ricocheting water and the near-hurricane velocity wind created by the mountainfall. Other cars were scrunched to suitcase thickness and thrown out from under the slide.
And the water stayed—held by the earthquake-caused natural dam. It began to flood the lower end of the canyon. At the upper end, big sections of the road that would take the 300 people trapped in the canyon to safety crumpled and fell into Hebgen Lake, cutting them off from the world outside.
When the quake hit, summer Alternate Rangers Fred Tim and Lamont Herbold were on duty at the West Yellowstone entrance of Yellowstone National Park. They had just cleared a semi-load of Pres-to-Logs. As the truck pulled on through the gate, the plywood gatehouse shook so violently, with the lights flashing off and on, that Herbold shouted,
“Stop the truck, you ____, you’ve hooked the shack!”
Truck drivers Jack and Lyle Tuttle thought the frantic way their truck was flopping around meant the motor had broken loose from the mounts. Driving into the Park, they were halted by huge rocks blocking the road. Renewed shaking, with tons more rocks rolling down the mountainside sent them scurrying for cover behind trees. Lyle took refuge in a tree, where, he later said, the shaking seemed twice as rough.
When the quaking stopped briefly, they turned the truck around and were happy to get out before more boulders blocked their exit.
In the confusion that followed when the first shock hit, Jerry Yetter, who operates the Duck Creek Cabins near West Yellowstone, jumped out of bed and knocked on all the cabin doors to warn the occupants of the quake. Only after he’d finished the job did he realize that he was wearing no clothes at all.