Canyon geology Commuters who live in Alpine but work in Jackson probably have another word for it, but Highway 89 from Hoback Junction south to neighboring Lincoln County passes through a true geologic wonder. Alpine Canyon, aka the Grand Canyon of the Snake River or just the Snake River Canyon, slices through hundreds of feet of sedimentary rock to mark the boundary between the Snake River Range on the north and the Wyoming Range on the south. The topography includes precipitous cliffs, avalanche-prone gullies, and peaks topping out at over 9,000, 10,000, even 11,000 feet. And the Snake River, the force that continues to carve the landscape, attracts tens of thousands of rafters, kayakers, anglers and others each year.