Mammoth Pass

Summary  Link to more information about summary

Difficulty 3 Intermediate

6.8 miles round trip

8600 feet
+1050, -1050 round trip
Navigation Road, marked trail and map (compass may be useful)
Time Most of a day
Season Late November through early May
Snowmobiles Use Not permitted through mid-April. Moderate after mid-April. Contact Forest Service for transition date. [Please report illegal use of snowmobiles in this area.]
USGS Topo 7.5' series, Crystal Crag, Bloody Mountain
Start Lake Mary Road near Twin Lakes where the road is no longer plowed. The plowed parking area is just past (south of) the turn to Tamarack Lodge and Resort.

Description   Link to more information about description

The tour to Mammoth Pass is the most popular backcountry tour in the Lakes Basin. It follows Lake Mary Road for 70 percent of the distance, which is shared with track skiers, and 30 percent is cross-country.

You can extend the Mammoth Pass tour by skiing to Red Cones as described separately. From Red Cones you will be treated to a view of the Minarets, Mount Ritter and Banner Peak.

If you do not purchase a trail pass at Tamarack Cross Country Ski Center, you must stay off the groomed tracks.

Mileage Log   Link to more information about mileage log
Numbers in parentheses
correspond to mileage points on map

Waypoint 1 to 2
Miles: 0.0 - 0.6
Elevation change: +150

From the trailhead (1), ski south on Lake Mary Road for 0.6 mile until you reach the turnoff (2) on the east (left) side of the road to the site of the mining town of Old Mammoth and present-day Old Mammoth.

Waypoint 2 to 3
Miles: 0.6 - 1.3
Elevation change: +300, -50

Continue south on Lake Mary Road for 0.7 mile until you reach the first turnoff to Lake Mary (3).

Waypoint 3 to 4
Miles: 1.3 - 1.6
Elevation change: -50

Continue west and then northwest on Lake Mary Road for a total of 0.3 mile until you reach the second turnoff to Lake Mary (4).

Waypoint 4 to 5
Miles: 1.6 - 1.9
Elevation change: -50

Continue northwest on Lake Mary Road for 0.3 mile until you reach an overlook above Twin Lakes (5). This point is at the north end of Lake Marnie.

Waypoint 5 to 6
Miles: 1.9 - 2.5
Elevation change: +50

Continue northwest and then west on Lake Mary Road for a total of 0.6 mile until you reach Horseshoe Lake (6). Do not be tempted to seek refuge out of stormy weather in the well of the trees or structures located near the lake. Escaping toxic gases from the extinct volcano that formed this area can accumulate in these depressions.

Waypoint 6 to 7
Miles: 2.5 - 3.1
Elevation change: +400

Beyond Horseshoe Lake, the route follows a marked trail, the start of which is not obvious. Look carefully for the marker on the road's southwest end. This is the southwest end of the second parking loop.

In reality, following the marked trail may be more difficult and time consuming than it is worth. This is an ideal opportunity to practice using a compass. Take a bearing at Horseshoe Lake and follow it for the next 0.6 mile. You will be rewarded with learning a new skill.

Ascend southwest for 0.6 mile until you reach McCloud Lake (7).

Waypoint 7 to 8
Miles: 3.1 - 3.4
Elevation change: +0

Follow the north side of McCloud Lake to the west and then continue west for a total of 0.3 mile until you reach broad Mammoth Pass (8).

Return to trailhead
Miles: 3.4 - 6.8
Elevation change: +150, - 900

Retrace the route for 3.4 miles back to the trailhead (1).


Print version of map for tour