November 30, 2015
This trail system starts at about 1303 Glendora Mountain Road, where Google maps shows Lower Monroe Road as the trail. The trail ascends for about 8 miles, although you can drive Glendora Mountain Road about 8 miles up until a large opening on the right appears and just ride downhill. The trail provides a nice gradual up and down, with sweeping views of the mountains around Glendora. You can get some serious speed going down, but you'll want to stay alert for hikers in the area. For the most part, the trail near the top is smooth with the occasional ridges. The bottom features a lot more rocky, twisty sections without the steep drops of the top.
I would consider this a light intermediate trail.