"Following a trail doesn’t get any easier than this. Quarry Road closely parallels the Middle Fork of the American River, sometimes at water level, other times about 80 feet up on the canyon walls. Offering dramatic views of the deep river canyon and spots of whitewater flowing through it, the road receives plenty of shade from the oak and pine forest, especially after the first several miles from the trailhead at CA 49. Elevation gain is negligible, even though there’s a fair amount of short ups and downs, some of which can be steep for beginners and youngsters. Except for a few moments of moderately rocky or eroded terrain, Quarry Road is basically considered mildly technical. You can make this a leisurely half-day ride or a fast and furious workout by powering through the many brief rises. During the summer when the temperature is hot, the first mile or so from the trailhead is likely to be populated with folks enjoying an afternoon in the river’s many accessible swimming holes. Nevertheless, if you want to get away from the crowds, just continue farther on Quarry Road and you’ll see fewer people. The turnaround point is at Main Bar, about 5.4 miles out (10.8 miles round-trip)."