Hidden Falls are also sometimes called Tenaya Creek Falls or Three Chutes Falls. Depending on the season and runoff levels, water cascades down the rounded rock face in three major plumes. There is a nearby flat rock to bask on that also doubles as a primo picnic spot. This is a special spot beloved by locals - be respectful and don't mess it up!
The off-trail hiking is difficult and rockfall in this area can be dangerous (especially after/during a rain). Beware of slippery and loose rocks, don't wade or swim when the conditions are not safe. People have died here. Do not venture past the top of the falls as it is very easy to become lost in the "Bermuda Triangle" of Tenaya Canyon.
Short Hike: Hike to the far eastern end of the Mirror Lake Trail and stop at the footbridge. Look for an obscured, unofficial trail on the southeast side of the creek. Head upstream, boulder hopping and scrambling. Use a large downed log to cross the stream and after a bit more ascending you'll see the falls. They are about 1/2 mile from the footbridge.