After parking at the marked trailhead, take a left at the first fork and follow the double wide track until you come upon a second fork. Take a right at this fork to remain on the lower level trail which skirts the Upper Trinity Trail levee. You'll pass one ramp that goes up to upper trail; stay to the right and keep following lower trail until you see a second ramp. Take this ramp and follow the trail until coming to a mid-size open area and look for a jeep doubletrack to the right.
Take this jeep doubletrack to connect to the dirt road. Once you get to dirt road, go right and follow the trail through the woods. About 0.5 miles down this trail, look for a stone path to the right (it will be right behind a house). Follow this path to the waterfall! Take your shoes off and dip your feet and enjoy the cool, running water. Once you reach the waterfall, you have essentially made it back to the starting point, just head up the slight incline and your car should be in view!