Here is the ANF info for the Clarion dispersed campsites mentioned.
http://www.fs.usda.gov/recarea/alleg...=6140&actid=24
Note that the new restrooms at Robin Island were finished last year. Check the roadside info board at the mouth of Millstone Creek for a map showing where the campsites are. Also, note that if the dispersed campsites are full (it happens - they're free after all) that there is a great riverside campsite (boat in/hike in only) between Arroyo and Irwin Run, right at 'Y' rapid.
Steve Z