Tunnel Lake Trail

HARD 3 reviews
#77 of 117 trails in

Tunnel Lake Trail is a 8.8 mile moderately trafficked out and back trail located near Nathrop, Colorado that features a lake and is rated as difficult. The trail is primarily used for hiking and mountain biking and is best used from July until September. Dogs are also able to use this trail but must be kept on leash.

8.8 miles
1,938 feet
Out & Back

dogs on leash


mountain biking


wild flowers

Directions from Nathrop: Southern Access: Drive 15 miles west on Chalk Creek Road (Coutny Road 162) to St. Elmo. Turn south on Hancock Road (County Road 295) and drive approximately 5.5 miles. Look for Forest Road 298 (recommended for 4WD only), which is the old railroad grade to the Alpine Tunnel. Travel 2.5 miles on this road and take the trail over the tunnel to reach the trailhead for 1439.

Saturday, September 12, 2015

Beautiful hike only ran into a handful of people during hike and had the lake to ourselves for a couple of hours.

Thursday, September 03, 2015

Beautiful location and setting just off the Continental Divide. Hiked in early Sept. Great location, I was all along. Not many level good spots to pitch a tent. Lots of low brush around the lake making it hard to navigate around the lake. Some maps or GPS show a low trail to the Lake. This does not exist, follow the high trail around the upper rim of the CT.

Tuesday, July 01, 2014

This was my first ever hike in Colorado, and it kicked my ass. We did it in the middle of July, and we saw maybe 6 or 7 other people the whole time. Great views with only one real stretch of switchbacks. I wouldn't recommend it for beginners.