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black Glendo Loop

  4.7 ( 9 )

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14.3 mile 23.0 kilometer loop


Ascent: 1,419' 432 m
Descent: -1,418' -432 m
High: 4,903' 1,495 m
Low: 4,521' 1,378 m


Avg Grade: 4% (2°)
Max Grade: 28% (15°)


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Trail shared by Daniel McCoy

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This includes many of the greatest trails adjacent to Two Moon Campground for more advanced riders.

Daniel McCoy

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This loop incorporates some of the best trails into one large loop, for more advanced riders. It includes some twisty trail on the prairie and technical trail in the trees. Riding these trails in this direction makes a nice, long, fun ride.

Need to Know

If you are feeling like you need more mileage, add the trails to the north of Arrowhead (across the Glendo Park Road), like Toadstool and Narrows Bluff Trail.


Starting from any campsite in Two Moon (the best camping in Glendo for mtb. folks), take Two Moon Loop to Buffalo Run, crossing the road. Buffalo Run is a nice, casual ride through the prairie and then along the rim looking down on the power plant.

A few rideable switchbacks on 91 Gigawatt will take you down to the Power Plant. Cross onto the road, head across the bridge, and jump on the first singletrack you see to your left (but don't go left onto Raptor), staying straight. Switchback after the fence now starts up the most difficult climb of the ride on Rattlesnake Rim. Good luck cleaning the tough rock sections (if you do it all, you are a rad rider!)

At the top of the climb, duck off to the right to add Porcupine as a loop if you feel that 14+ miles is too short. Continue on Rattlesnake Rim until you hit the junction for Feather Rim (but don't take the right turn for Turkey Spur!). If you start descending switchbacks down Rattlesnake Rim, you missed your turn.

Feather Rim is probably the best segment of this ride; you are always "on" and this trail feels a lot longer than it actually is. At the end of Feather Rim, stay straight and follow Thunder to Arrowhead. This will put you to the top of Slide Hill Loop, which is best ridden down (sweet teeter-totter!).

At the bottom of Slide Hill Loop, cross the road to gain the other trail system and to access Slide Hill Loop East. Slide Hill Loop East can be full of hikers, so be respectful. I take Slide Hill Loop back over the road again because that downhill is super fun.

Jump on Barrel Roll to descend back down to the lower part of the dam. This area can be confusing, as there are multiple intersections. Each intersection has a map and a number. Reference the number on the post to find out where you are on the map. This loop adds the bottom of Thunder to intersect with Wetland Trail (which is a dirt road) at the bottom. Cross the bridge back down river, and then connect with Rocky River on the other side. This is a fun, somewhat technical trail.

You are probably getting tired now, just one more significant climb up Root Canal before you are back towards your campsite! Root Canal has a significant climb in it. Once up top, take Reflector Loop to the right, then Broken Bow to connect to Two Moon Loop on the east side of the campground. Follow Two Moon Loop back to your campsite!

History & Background

All these trails have been built since 2012 specifically for mountain biking. Many trails are consistently technical and require you to move your bike. There is less focus on open-it-up flow trails. Expect these to be harder miles than what may be typical.


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Aug 4, 2018
Nathan Beauchamp
Jun 10, 2018
Mark Carleton
Sep 3, 2017
Bryan Walsh
Aug 21, 2017
caldern e
Aug 19, 2017
Paul Billings
Love the teeter on Slide Hill. Lots of hike-a-bike on Feather Rim for those without massive lungs/legs. Bring lots of water when it's hot.
Jul 24, 2016
Corey Robinson

Trail Ratings

  4.7 from 9 votes


  4.7 from 9 votes
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My new all time favorite. Do not let the mileage or lack of red in the elevation Chart fool you. The climbs AR very technical and require huge bursts of energy to master. Carry plenty of water. Some vertical exposure. Some unnerving rock face drops. Some great Flowy sections. The ride really kicks off with theFun. Technical. Physically demanding. Sometimes a bit frightening. Loved it. Aug 30, 2017
Rob Kelly
Denver, CO
Rob Kelly   Denver, CO
I really expected this ride to be more fun than it ended up being. Buffalo run was fun, but other than that I felt that most of the sections were either borderline ridiculously difficult (steep rock feature into steep rock feature into a bermed corner into guess what, a steep rock feature) or not ridden enough (weeds/grass over trail or just loose rock or dirt that hadn't been 'packed', looking at you, 91 gigawatt) as well as overall lacking flow with the exception of the area in the back of the ride with Thunder/Barrel Roll/etc. I'd consider myself a solid intermediate-advanced rider and I think I had more pedal strike on this ride than all my previous rides combined, seriously. I must say that these trails are super well built, signage is great, and there's even sunscreen at the trailhead. Might be the perfect ride for someone else but I honestly felt like riding this was a chore moreso than almost any ride I've done. If I had to do it again I'd definitely swap the two and climb 91 gigawatt and descend root canal. Aug 21, 2018

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