From Highway 20 at Ashton, Idaho, access the Mesa Falls Scenic Byway (Idaho State Road 47). Follow Idaho State Road 47 for about six miles to the Yellowstone National Park / Cave Falls sign. Take a right onto this road and continue to the picnic areas. These picnic area are about 26 miles from Ashton, Idaho, 11 of which are on a good gravel road.

This expansive waterfall of the Falls River in the southwest corner of the park is only 20 feet high, but its spectacularity rests in the fact that, at 250 feet wide, it is probably the park's widest waterfall. Its immediate upper step is about 3 feet high and a lower step about a 100 yards downstream is around 5 feet high.

Explorer W. C. Gregg and topographer C. H. Birdseye named the fall in 1920 - 1921 for the existance of a 50 by 50 foot cave just below the falls on the river's north bank. Gregg wrote: "The cave is one of those extravagant gifts of the Creator, thrown in on top of more than we could ask for." Please note that the "Cave" on the north end of the falls collasped a number of years ago and no longer exists.