There is a ton of bouldering at McClellan. The boulders are scattered all over the area, and range in dificulty from V-easy to V-hard. There are a lot of good problems near the southern parking area. Some of the problems at McClellan are definitely high ball. The bouldering (and the climbing in general) is great at McClellan, beacuse it has a very secluded feeling. The problems don't always see aton of traffic, so bring a brush.
All of the pictures posted by me were taken by lovely wife, Lia.
Park at one of the two main areas and explore. The bulk of the problems, and more concentrated areas are probably closer to the southern parking area. There are a few routes to north of the turn off for the north parking lot. These are on the west side of the road.