4.8 miles
Distance
1,615 ft
Climb
-375 ft
Descent
03:34:32
Avg time

Details

  • Riding area
  • AKA
    Cottonwood Lake
  • Difficulty rating
    Blue
  • Trail type
    Singletrack
  • Bike type
    AM, XC, Fat
  • Trail Usage
    Multi-use
  • Direction
    Both Directions
  • Climb Difficulty
    Black Diamond
  • Physical rating
    Hard
  • Season
    July-October
  • eBike Allowed
    No
  • Global Ranking
    #7311
  • Land Manager
    USFS

The high elevation and thick timber make this trail one of the last in the region to shed snow, and drifts are common into late June. The trail to Cottonwood Lake is very popular with backcountry horsemen and horsewomen, so be alert, and make sure to park courteously, leaving room for horse trailers to turn around.

The trail to Cottonwood Lake is a moderate climb. From the lake, the trail climbs steeply to the top of Thunderbolt Mountain via the L.O. Connection. The junction is at the north end of the lake; if you carry on farther than that you have missed it and are headed into the Little Blackfoot watershed.

Access Info

Take the Bernice exit of I-90 (Exit 151) and follow the Boulder River Road (staying to the left). Stay on the Boulder River road to the Thunderbolt Creek road, which is directly opposite the Whitehouse Campground. The junction is a distinctive Y and is signed. The Thunderbolt Creek road ends at the trailhead.

Local Trail Association
More Stats for Thunderbolt Mountain Trail 65 mountain bike trail
  • Altitude change
    1,240 ft
  • Altitude min
    1.2 miles
  • Altitude max
    1.4 miles
  • Altitude start
    1.2 miles
  • Altitude end
    1.4 miles
  • Grade
    4.871%
  • Grade max
    -29.663%
  • Grade min
    37.776%
  • Distance climb
    3.5 miles
  • Distance down
    1.1 miles
  • Distance flat
    1,520 ft
  • Avg time
    03:34:32
  • view trail stats
Status:
on Aug 16, 2015
Dry
Avg: 4.5 (2 votes)

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Thunderbolt... Trail Reports

datedescription
Aug 16, 2015 @ 11:17am
Aug 16, 2015
reporter
May 31, 2015 @ 6:57am
May 31, 2015
As of Memorial Day weekend, there were significant drifts in the last half-mile below Cottonwood Lake, and solid snow above the lake.
view all reports »

Technical Trail Features (TTF)

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Routes with this trail

titleratingdistance
Thunderbolt Mountain
13.3 miles

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