As you’re hiking to Ouzel Falls from the Wild Basin trailhead, you will pass multiple named waterfalls including Upper and Lower Copeland Falls and Calypso Casacades. In between those falls, you can actually find multiple other drops along the river. Some of the drops are probably not significant enough to be recognized, while others are actually rather large. At this specific drop, the river narrows quickly, forcing the water through a very small path, creating an impressive force. The only view of the falls is from above, which can photographing it difficult.
1) Drive north on CO-7 past Allenspark. A few miles after passing Allenspark, you will see an entrance for Rocky Mountain National Park indicating the Wild Basin Trailhead. Turn left here.
2) Drive down the road for a very short distance to the park entrance. You can pay the entrance fee here.
3) Drive down the rather narrow dirt road to the very end. This will be the parking area for the Wild Basin Trailhead. It may be advisable to arrive early in the summer, as the parking area only has 20-25 parking spaces.
4) From the parking area, begin walking on the Wild Basin Trail. This falls will be past Copeland Falls, but I think it is before Calypso Cascades.
Where in the World is Unnamed Falls #2?: map