Boulder Open Space and Mountain Parks
Autrey Reservoir & Coalton Trail
8.6 mi · ▲ 578 ft · 3 hr 9 min
Autrey Reservoir & Coalton Trail is an 8.6-mile out-and-back in Boulder Open Space and Mountain Parks near Marshall, CO. The route reaches Autrey Reservoir at the turnaround, 4.3 miles in. It climbs 578 ft and is mostly dirt. It scores 0/100 on the Ambleway Wildness scale: paved and peopled.
Elevation
Getting there
Directions
Autrey Reservoir & Coalton Trail
8.6 mi · ▲ 578 ft · 3 hr 9 min
Elevation 5,398–5,964 ft
Out & Back · Boulder Open Space and Mountain Parks
Trailhead: High Plains Trail · 39.91434, -105.20840
Weather Sep 4: Overcast, high 90°F / low 62° · precip 8% · wind 11 mph · sunrise 6:32 AM · sunset 7:29 PM
Parking lot at the trailhead
- Start on High Plains Trail, heading NE.
- 0.1 miBear left onto Coalton Trail, heading NE.
- 2.8 miContinue straight onto Coalton Road, heading E.
- 200 ftTurn left, heading E.
- 200 ftTurn left, heading E.
- 450 ftTurn right, heading NE.
- 150 ftContinue straight onto Rock Creek Trail, heading E.
- 0.2 miBear left, heading E.
- 0.1 miTurn right, heading NE.
- 0.2 miTurn right, heading E.
- 0.5 miTurn left, heading NE.
- 50 ftBear right, heading NE.
- 0.2 miReach Autrey Reservoir, then turn around and head back the way you came.
- 0.2 miBear left, heading S.
- 0.4 miTurn right, heading SW.
- 0.2 miTurn left, heading SW.
- 0.2 miTurn left, heading SW.
- 0.1 miTurn left, heading W.
- 0.3 miTurn left, heading SW.
- 400 ftTurn right, heading SW.
- 200 ftTurn right, heading SW.
- 100 ftContinue straight onto Coalton Road, heading SW.
- 100 ftContinue straight onto Coalton Trail, heading SW.
- 2.8 miBear right onto High Plains Trail, heading SW.
- 50 ftArrive back at the trailhead.
Each distance is the walk from the previous step. Tap a step for a map of its junction.
Trail surface
Weather
Good to know
- Parking lot at the trailhead
More from High Plains Trail Trailhead
- Rocky Mountain Greenway Trail 3.1 mi · ▲ 302 ft
- Greenbelt Plateau Trail & High Plains Trail 4.9 mi · ▲ 190 ft
- Coal Seam Trail–Community Ditch Trail, 4 sights 13.4 mi · ▲ 566 ft
- Coalton Trail–Greenbelt Plateau Trail Loop, 6 sights 13.7 mi · ▲ 830 ft
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