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Mammoth Gulch
Gilpin County, Colorado
Roosevelt National Forest
Boulder Ranger District
View this on the Colorado Trailheads Map

Forest Service Roads: 176.1, 183.1
County Road: 4N
Trail Type: Out and Back
Nearby Towns: Rollinsville
Nearby Trails: Kingston Peak, Jenny Creek, Rollins Pass East, Moffat Tunnel Road
Trail Length: 5 miles
Elevation: 8,961 to 9,983 feet

This trail is not particularly long or challenging, but it has some nice things to offer. It's very easy to get to and very easy to find. In addition, you can see what happens to a valley 20 years after a reservoir is drained.

Start on Mammoth Gulch Road just outside the town of Tolland, which is very near to the town of Rollinsville. It starts climbing immediately, but the trail is not very rough. You will come to an intersection where there are three numbered trails. The leftmost trail is the start of the Kingston Peak trail, and the other two are the forks of the Mammoth Gulch trail.

The rightmost fork can't be missed. It's a short and fairly easy trip to the end at a large parking area. There are many nice campsites along the way, and this area is often busy. The parking area features a sign describing the drainage of the Mammoth Creek Reservoir, and the scenery is gorgeous.

If you take the center trail from the intersection you will travel past many more nice camping areas. It isn't long before you come to a forest service sign that marks the trail as a dead end. We recommend that you turn around here if you are in a vehicle or with a group.

You can continue along the trail if you wish, through the trees. It isn't long before you come to a gate and it is very difficult to turn around here. If you have more than three vehicles here it can be quite challenging to get everyone turned around. There isn't anything to see except the gate, so the trip past the dead end sign really isn't worth it. You could continue past the gate to the Andrew Lode Mine as recently as 2004 but it is now closed.

Return the way you came in.

Information last updated on July 24th, 2016.

Member Reports

Driving Directions

Take I-70 or U.S. 6 from Denver to Highway 119. Take this through Blackhawk to Rollinsville. Turn left on F.S. 149 and take this gravel road through the tiny town of Tolland to find Mammoth Gulch Road as a left turn at a street sign just on the other side of town.

Meeting Places

Meet at Starbucks at 3033 Arapahoe Avenue in Boulder. This is also immediately next to a gas station, Moe's Bagels and King Soopers.

Low-End Rating: 2
High-End Rating: 3
Rock Crawling:
Dirt & Mud:
Water Crossings:
Cliffs & Ledges:
Climbs & Descents:
Other Activities:
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Trail Photographs

Start of the Trail Drained Reservoir Blue Sky

Maps and Coordinates
(Click a map to view full size)

Trail in Red
600 x 600 pixels
222 KB

Mammoth Gulch (GPS Exchange File)
Mammoth Gulch Track (Google Earth Track)
Mammoth Gulch Trailhead (Google Earth Placemark)
Drained Reservoir (Google Earth Placemark)
Turn Around Here (Google Earth Placemark)
Gate (Google Earth Placemark)

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Trail information is only accurate on the date posted. Trails may have changed or closed since that date. Use this information for historical purposes only. Contact the Forest Service or Bureau of Land Management for up-to-date trail information.

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