That is Cascade Falls
But the hike is a quick .5 mile walk across some breaks (large geological formation) and takes you to a small cascade that come out of the mountain. The most interesting part about it all is that it is a river coming out of a cave in the side of the mountain.
The water is actually from Navajo Lake, where it drains out through a sink hole near the docks.
To get here, travel up highway 14 till you get to the Navajo lake turn off. Head down that road for a few miles and you will see the turn off to the left that says Cascade falls. Make a left here and stay left when you see your first turn off. There is a sign just a mile or so down the road that says Cascade falls.