Twin Lakes
Bryon
Maybe some visual clues will help. I don't have a photo of the trail near the campsite in the original photo, but here are a few that are within a half-mile of it.
The first is taken from the trail about a quarter-mile east of the campsite.

The second photo is of the trail at that same location, facing east. The burned area, which is to the left in this photo, came up to the edge of the trail but did not cross it.

The last photo shows the trail heading east about a half mile from the campsite.
Rob,
No, it's not the Elk Lake Creek trail.
If you like to swim, this trail will take you to two good places to do that.
I'm pretty sure Kirk is right about the nails - I was on that trail a couple weeks ago, and remember seeing those nails on old rotted bridges across small creeks.
On to the real trail in question - I'm guessing it is the Elk Creek trail, maybe at the old site of the shelter? Where the Mother Lode trail comes in? I know there are lots of areas to camp there, although I can't say I remember seeing a place like what you posted. But it does roughly fit. There are seasonal waterways in that area, and people could hike through to Elk Lake (a major attraction).
Donald Presley said
So Doug, the trail is a 100' away from this picture. I can step a 100 feet away from a lot of trails and take pictures and nobody would know where the f* I was but me. Hello! We try to make it so others can figure out where we might be on a TRAIL. I guess I need to post pictures of nails in logs and have you guess what trail I am on? Here's one:
Don
Let me try! Let's see, there are nails in a tree, so the trail name must have something to do with a tree. I'm going to go with Alder. And it looks really damp... so it must be Alder Swamp Trail!
Am I right?
Kirk

So Doug, the trail is a 100' away from this picture. I can step a 100 feet away from a lot of trails and take pictures and nobody would know where the f* I was but me. Hello! We try to make it so others can figure out where we might be on a TRAIL. I guess I need to post pictures of nails in logs and have you guess what trail I am on? Here's one: