It's not a water slide or a snow slide, unfortunately. The Devil's Slide is an unusual rock formation east of Ogden, Utah. The limestone ridges are 12 meters high, 4.5 meters apart, and a very long 245 meters long, straight up the mountain.
It's the site of a ghost town of the same name, which is sad because Devil's Slide sounds like a totally awesome town name. I'd consider moving there for the sole purpose of claiming that as a home address.
-via Atlas Obscura