Who says you need to endure a long, strenuous hike to see cool stuff in Arizona? On the short, easy hike to Keyhole Sink Trail, located a half-hour west of Flagstaff, AZ, you can see petroglyphs, a waterfall, and much more.
Breathe in the scent of towering pine trees and enjoy the high-altitude breeze as you wind your way through the intermittent shade. In less than a mile, you’ll arrive at a picturesque lava flow sinkhole where you can discover petroglyphs etched into the rock by native people a thousand years ago.
If you time your visit just right, you might also see a waterfall refilling the sinkhole basin that some native tribes attach a spiritual connection to. Along the way, be on the lookout for massive tree stumps, ancient artifacts, tree frogs and other wildlife.
Why is it called Keyhole Sink?
Keyhole Sink is a rare oasis in the Kaibab National Forest. It’s a keyhole-shaped lava flow with a pool of water at its base known for seasonal waterfalls. A sink, short for sinkhole, is a topographic depression formed when underlying limestone bedrock is dissolved by groundwater.
- Length: 3/4-mile one way, 1.5 miles round trip
- Difficulty: Easy
- Highlights: Petroglyphs, Waterfall (seasonal)
- Precautions: Rugged shoes recommended
- Trailhead: Oak Hill Snowplay Area
- Pass/permit required: None
Note: 1 mile = 1.6 kilometers
As you hike to Keyhole Sink, keep an eye out for evidence of some of the area’s first residents in the ancient basalt lava rock. The region is the ancestral homeland to the native tribes including the Navajo, Hopi, Hualapai, Zuni, Havasupai, and Yavapai.
What you’ll experience on this hike:
- Tall, healthy stands of 100-year-old ponderosa pine trees and new-growth aspen trees
- Ancient tree stumps left behind by lumberjacks who cut down trees in the early 1900s for a logging railroad
- Petroglyphs etched into the rock wall at the end of the trail
- A seasonal waterfall fed by snowmelt and rainfall
Hint: To view the petroglyphs, walk around the left side of the water basin.
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Some of the coolest things to see in Arizona require a lot of effort. Keyhole Sink does not. It’s a unique site with petroglyphs and a seasonal waterfall that’s fairly easy to get to. Just park in the Oak Hill Snow Play area lot (mapped below) and look for the trailhead gate across the road.