Portage Pass

The feel

The trail starts in low shrubs, then goes into trees, and by the top of the pass it is open tundra. The grade is a steep uphill hike on rocky tread 24-48 inches wide. Divide Lake, 1 mile into the trail, is a good picnic site.

From the top of the pass you look west to the retreating Portage Glacier and the lake below, and it is the only hike with a view of Portage Glacier. Mountain goats live in the area, and it is a good spot for bird-watching. The route to Portage Lake has an overlook with great views of the glacier and lake, and ends with a final descent to Portage Lake.

What to expect

Route and terrain

Out and back, 4.2 miles total, with 750 to 1400 ft of gain; about 2 miles one way. Steep and rocky, from low shrubs through trees to open tundra at the pass.

Time

2 to 4 hours.

Crowds and best time

Public use is high. Foot traffic only from April to June.

Parking

The trailhead is on the right of the gravel road marked "Forest Access", the first right past the railroad tracks on the Whittier side of the tunnel.

Fees and passes

There is a fee to travel through the Anton Anderson Memorial Tunnel to reach the trailhead.

Kids

A good day hike for all ages, though the hike has steep sections.

Hazards

A steep, rocky climb. Snow often remains through June. There is private land on both sides of the lower section, so stay off the railroad tracks. Dress for changing weather.

Bathrooms and water

Bring your own drinking water, and filter or boil any creek water for five minutes before drinking it.

Season and access

Open summer to winter, with snow often remaining through June. The trailhead is reached through the Whittier tunnel.

Mingo says

Choose a clear day, because Whittier weather is a gamble and the view of the glacier is the reason you climb. Early in the summer, expect snow underfoot on the steeper second half of the climb.

Before you go

• Pay the toll and check the Anton Anderson Memorial Tunnel schedule on the Alaska Department of Transportation website before you drive.
• On the Whittier side, take the first right past the railroad tracks onto the gravel road marked "Forest Access".
• Pack hiking boots and water for the climb.
• Call the Glacier Ranger District at (907) 783-3242.

Written October 2026. Sources are listed at the end of this page.