not very much access, but might not be too bad right now with the low summer water. be careful with those "trout", most of them are steelhead smolts(i know there are some nice cutthroat in there though). you probably won't see anyone else fishing until the fall, when the hordes of people off the i5 corridor all converge there for salmon season.
don't leave anything of value in your car, lots of tweakers in that area(especially around schaffer state park).