El Prieto to Brown Mountain Loop

From the parking lot near the JPL entrance, follow the paved trail that turns to a dirt road for about 1.25 miles. Take the right fork towards El Prieto/Brown Mountain for about 0.25 miles, then stay right onto El Prieto. Follow this steep trail for about 2 miles until you reach Brown Mountain Fire Road. Turn left here and climb up to the saddle between Brown Mountain Fire Road and Fern Truck Trail. Descend down Fern Truck Trail (also called Brown Mountain; the left-most trail when you reach the saddle) back to the junction where you took El Prieto, and head back the way to came to the parking lot.You can also do the loop in reverse, but hiking down El Prieto is a little less desirable. You can also add an out-and-back from the Brown Mountain Saddle towards Ken Burton Trail if you are looking for a longer hike. El Prieto has a few off-shoots, but they'll all reach Brown Mountain eventually.