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The Quarry Trail Lollipop is a popular hike and trail run in the Auburn State Recreation Area that combines an old road grade with some singletrack trails.
The old road grade roughly parallels the Middle Fork American River, providing beautiful views of the water and valley. The Wendell T Robie Trail forms the other half of the loop portion of this route.
With steeper climbing up the mountainside, this trail adds a bit more difficulty and strenuousness to the run.
For an easier jaunt, just stick to the lower trail. This trail is notable as a portion of the famous Western States 100 trail running course.
There's also an old quarry located just off the hiking route that's a popular rock climbing area. Sources: https://placerdigital.com/hiking-trails/quarry-trail/