How to get here:
On the 79 exit close to mile: 45.7, take the the Chihuahua Valley Road (asphalt) and drive for 6.4 mile.
Don't miss the exit in the bend, there is a yellow arrow sign "Lost Valley 10 miles" (see picture), pointing to the road on the right, heading east.
Follow the dirt road, that gets a bit rougher, but should be fine for most cars, up to mile: 4.8.
At that point the PCT (Pacific Crest Trail) crosses the road, park.