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A varied forest and alpine route that travels through a man-made tunnel through a rock wall.

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Point to Point

7,266' 2,215 m


4,689' 1,429 m


2,528' 771 m


2,634' 803 m



Avg Grade (4°)


Max Grade (21°)

Dogs No Dogs

Features Birding · Fall Colors · Lake · River/Creek · Spring · Views · Waterfall · Wildflowers · Wildlife

Tunnel traditionally opens up after July 17. Bring bear spray.


The trail starts at the Iceberg/Ptarmigan trailhead behind the Swiftcurrent Motor Inn. It begins initially steep as this newer route is a cutoff trail to the old trail that came from the Many Glacier Hotel. Once you get up to the trail junction, the grade is steady all the way up to the tunnel.

The trail spends the first few miles traversing a wonderful hillside meadow. Views are jaw dropping in all directions. Moose frequent the valley below while bighorn sheep and mountain goats are frequently seen above. Bears may be seen anywhere in this area.

As you head up the trail, you begin to get into the forest, limiting views. The trail crosses Ptarmigan Creek at a great little waterfall. Shortly thereafter, the Iceberg Lake Trail breaks off to the east. The Ptarmigan Trail works its way up through a forest carpeted with huckleberry plants and gradually breaks out of the trees. The rock walls on either side escort you up the valley towards the headwall of the valley. Just before you begin the switchbacks up to the tunnel, you pass along Ptarmigan Lake.

You wrap around Ptarmigan Lake along its west shore, then leave the vegetation and work your way up the rocky slopes. Two big switchbacks take you up to the amazing tunnel with epic views getting better with every step.

The tunnel is 250 feet long and is wide and tall enough for horses. The other side of the tunnel opens up to steep red rock cliffs and an amazing view of the Belly River drainage with Elizabeth Lake down at the bottom of the valley. The trail here is hewn from the rocky cliffs and is breathtaking as you descend into the valley. Each step reveals the amazing ridgeline to the northwest including Old Sun Glacier on the Mt. Merritt.

The trail descends through the cliffs turning into a trail along red rock slopes. You get into vegetation which gradually turns into trees. A look up the drainage reveals Ahern Glacier, many more summits and Helen Lake. From here, the trail enters the trees, meets up with the Red Gap Pass Trail, then descends to the foot of Elizabeth Lake where it crosses a footbridge and goes to the campground.

The level trail follows the Belly River downstream through trees. It leaves the river for a short stint, then comes back alongside at the top of the fantastic Dawn Mist Falls. It continues down, wraps around Cosley Ridge, then fords the outlet of Cosley Lake.

This content was created by Jake Bramante of Hike 734. Visit hike734.com for more expert Glacier content and maps that help you decide which trail to hike.

Flora & Fauna

Incredible variety of Glacier's flowers from beargrass and geraniums to low growing alpine plants. Small mammals from tree squirrels to marmots and large animals ranging from deer to moose to black and grizzly bears to bighorn sheep and mountain goats.


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Jake Bramante

Trail Ratings

  4.6 from 5 votes


in Many Glacier


  4.6 from 5 votes
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in Many Glacier


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9 Views Last Month
2,164 Since Sep 3, 2015



Trip video of the Poia Lake/Elizabeth Lake/Ptarmigan Tunnel loop with Iceberg Lake.
Jun 14, 2016 near Swiftcu…, MT
Trip video of Stoney Indian Pass down to the Waterton Valley with Bear Mountain Point, Elizabeth Lake and Helen Lake as well.
Jun 13, 2016 near Swiftcu…, MT
Crossing the ford at the east end of Cosley Lake.
Sep 2, 2016 near Swiftcu…, MT
A view of Mount Wilbur from the Iceberg Lake / Ptarmigan Tunnel Trail.
Jan 31, 2016 near Swiftcu…, MT
Switchbacking Ptarmigan Wall above Ptarmigan Lake near the tunnel. with permission from phil h
Jun 14, 2016 near Swiftcu…, MT
View from inside tunnel
Aug 22, 2018 near Swiftcu…, MT



Current Trail Conditions

Add Your Check-In


Jul 28, 2019
Mallory Fossa
Did with iceberg lake trail, make sure you go through tunnel other side is beautiful.
Jul 16, 2018
Chris Guy
Jul 24, 2017
Michael Dotson
Jul 22, 2017
Michael Dotson
Aug 23, 2016
Kristi Rowell
Aug 1, 2016
David Gilbert
Jul 27, 2016
Dee O'Hair
Jun 23, 2016
Jeff Giesler
Did first 2+ miles as front end of Iceberg Lake Trail. 2.8mi