This is a beautiful little waterfall on the left fork of Mill Creek, just east of Moab. It is a popular hiking destination where the stream is the trail - you've got to wade in some spots to get to the waterfall. People enjoy jumping from the cliffs into the plunge pool below the waterfall.
From downtown Moab, follow Mill Creek Drive and then Powerhouse Lane east to the edge of town and the trailhead.
It is a great hike during warm weather. If you go on a summer weekend, expect to see a crowd and you will have to fight for a parking spot.