Summers and Rooster Rock are like peas and carrots; they just go together. Three miles of sandy beaches bring out the crowds. One of the largest swimming areas near Portland serves visitors who want a natural experience. It's even more natural the farther east you go at Rooster Rock (where you?ll find one of Oregon?s two designated nude beaches). By design, the nude beach area is completely separate and not visible from the clothing-required area of the large park. The two areas coexist in harmony.
http://www.oregonstateparks.org/park_175.php