My son and I fished up there last summer. The water was pretty good considering the drought and we caught a fair number of fish from the picnic area to about 300 yards upstream. Like has been said, it's a lot of boulder climbing. Some of those rocks are the size of my living room. Be careful as the space between the rocks on the stream bed can catch you by surprise and what is knee deep water can suddenly become chest deep in about three inches of space.
Here is a photo I took of the area. It is quite beautiful and worth the fishing. Just be cautious of where you step and watch out climbing over and around the boulders. They can be slick. I fell once but did not hurt anything more than my pride. What hurt most was when my 12 year old son started laughing and reached down his hand to help the senior citizen up off the ground.