Difficulty PG Distance 2.1 to 5 miles General information: Dogs allowed General information: Hikes with free parking Rating: 7-8 San Gabriel Valley & Foothills (East) Season: All year

Lower Monroe/Poopout Hill Loop (Big Dalton Canyon)


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View of the San Gabriel Valley from the Poopout Hill Trail
View of the San Gabriel Valley from the Poopout Hill Trail
Oaks on the Lower Monroe Truck Trail
Oaks on the Lower Monroe Truck Trail

Lower Monroe/Poopout Hill Loop (Big Dalton Canyon)

  • Location: Angeles National Forest foothills north of Glendora.  From L.A. and points west, take I-210 to Grand Avenue.  Head north on Grand Avenue for 2.2 miles and turn right on Sierra Madre.  Go 2 miles and turn left on Glendora Mountain Road.  In 0.6 miles, park on the left side of the road in a dirt turnout just past the intersection with Big Dalton Canyon.  From San Bernardino/Riverside, take I-210 to Lone Hill.  Turn right on Lone Hill, go a mile and turn left on Foothill.  Go 0.5 miles and turn right on Valley Center.  Go 0.8 miles and turn left on Sierra Madre.  Make a quick right on Glendora Mountain Road and go 0.6 miles to the parking area.
  • Agency: City of Glendora/Angeles National Forest
  • Distance: 3.8 miles
  • Elevation gain: 800 feet
  • Difficulty Rating: PG
  • Suggested time:  2 hours
  • Best season: Year-round
  • USGS topo map:  Glendora
  • Recommended gear: hiking poles
  • More information: Park map here; description of the Lower Monroe Truck Trail here; Every Trail report here
  • Rating: 7
0:00 - Start of the hike, Glendora Mountain Road (click thumbnails to see the full sized versions)
0:00 – Start of the hike, Glendora Mountain Road (click thumbnails to see the full sized versions)

This enjoyable hike combines city streets, single-track trail, fire road and ultimately a very steep descent, providing nice variety and seclusion just a short drive from the busy San Gabriel Valley. It can be done as described here, as a point-to-point with a short shuttle or perhaps as a longer hike, continuing along the Monroe Truck Trail to Summit 2760 and beyond.

0:21 - Beginning of the Lower Monroe Truck Trail (times are approximate)
0:21 – Beginning of the Lower Monroe Truck Trail (times are approximate)

You start with a pleasant, if not terribly interesting, 3/4 of a mile on Glendora Mountain Road. While the shoulder is narrow, car traffic is likely to be light (although you’ll probably see quite a few cyclists.) As the road makes a hairpin turn to the left, cross it and look for the signed Lower Monroe Truck Trail. Truck Trail is somewhat of a misnomer as the route is a single-track. The hike instantly becomes more scenic as you work your way through the wooded canyon.At 1.4 miles, a short spur leads to an abandoned water tank with some graffiti that I will forgive because it doesn’t interfere with the beauty of the hike, and because it displays a certain wit (but because NHLA is a family blog, I cannot report what the graffiti says.)

0:45 - Beginning the ascent from the canyon
0:48 – Beginning the ascent from the canyon

Shortly afterward, you make a sharp right turn and begin your ascent from the canyon. You get nice views of the San Gabriel Valley as you make your way along the west-facing slope. At 3.1 miles, you reach a saddle where the Monroe Truck Trail continues uphill and the signed Mystic Canyon Trail heads downhill. Mystic Canyon is a slightly longer alternative route, descending a mile to Big Dalton Canyon Road, where a half-mile walk will bring you back to the parking area. This route, however, descends on the uber-steep Poopout Hill Trail. Take a few minutes to enjoy the view and make sure your legs are rested before beginning this stretch.

1:30 - Beginning the steep descent of Poopout Hill
1:30 – Beginning the steep descent of Poopout Hill

The Poopout Hill Trail is an unsigned firebreak that branches off to the right, just before the Mystic Canyon sign. You make a short but steep descent, a brief climb and another steep descent before the trail levels out for a little while. The last 0.3 miles, however, drop nearly 500 feet – requiring hiking hiking poles, or perhaps the use of the “fifth limb.” Not helping is the fact that the trail is loose and washed out in spots.After navigating down the grade, you are deposited back at the corner of Glendora Mountain Road and Big Dalton Canyon. Cross the street to return to the parking area.

1:50 - Completing the loop at the bottom of Poopout Hill, Glendora Mountain Road
1:50 – Completing the loop at the bottom of Poopout Hill, Glendora Mountain Road

Text and photography copyright 2013 by David W. Lockeretz, all rights reserved. Information and opinions provided are kept current to the best of the author’s ability. All readers hike at their own risk, and should be aware of the possible dangers of hiking, walking and other outdoor activities.  By reading this, you agree not to hold the author or publisher of the content on this web site responsible for any injuries or inconveniences that may result from hiking on this trail.  Check the informational links provided for up to date trail condition information.


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