The Gunlock Waterfalls. On Old Hwy 91, about 15 miles outside of St. George and about 5 miles past Kayenta, lies an amazing collage of red rock cliffs, moss covered rocks, rivers, streams, mint green colored pools, and waterfalls. On a hot summer day, what better way to cool off than to jump into these refreshing natural pools. Bring the family, a good friend, or even go solo and enjoy the serene views and sounds of rushing water. This is definitely one of best things to do and funnest places to spend a day in Southern Utah! •Waterfalls and pools only exist if the water levels in Gunlock Reservoir are high.