There is a sign at the South end of the campground indicating some other trail... Follow it (maintained until you get to a high-tension power tower) and just keep to the right at most of the breaks in the trail. Great trail, a bit of elevation gain (like 3600 feet) over 2-3 miles. The continuation of the loop is the Ruckle Creek trail (about 5 miles back down) which you run into in the flats (relative) at the top. After you cross a stream the trail is faint and heads left.
It is a lot of fun and you rarely run into others on the Ridge section. Oh yeah -- park at the outer Eagle Creek parking lot (by the fish hatchery).