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Ice Lake Basin: Island Lake Loop to Fuller Lake

San Juan Triangle | Saturday, September 12, 2026

I didn’t have anything planned in advance for this weekend since Diane was going to be having her second brain surgery earlier this month and we didn’t know how long we were going to be in Wisconsin. Thankfully, things went a lot better this time than they did last year and we made it back home less than a week after her surgery, so I thought it would be nice to get out for a day hike into the San Juan Mountains on Saturday before the mountain season comes to an end. While I had hiked up into Ice Lake Basin over 14 years ago on my very first solo backpacking trip, I didn’t make it to Island Lake and Fuller Lake on that trip and this area has become so ridiculously popular and busy since then that I thought I might never return, but I decided to take my chances and give it another try, hoping that it wouldn’t be quite as busy after Labor Day.

I had checked the weather forecast before going to bed on Friday night and saw there were no storms predicted for the area, so it was a bit of a surprise when I woke up at 4:00am on Saturday morning and saw that there was currently a large thunderstorm system over the San Juan Mountains and Uncompahgre Plateau! The forecast was now calling for the storms to end around sunrise, and I was hoping that the clouds might linger around the peaks afterwards, so I carried on with my plans and started driving to the mountains. As I drove through the Uncompahgre River Valley I was able to watch the lighting flashes over the Uncompahgre Plateau off to the west. The rain finally stopped as I drove up the South Mineral Creek Road to the trailhead, so my timing was pretty spot on! I was hoping that the unexpected early morning thunderstorm might have kept some people away from the hike this morning, but the parking lot at the trailhead was already almost full when I arrived shortly before sunrise. I got one of the very last parking spots, then shouldered my pack and started hiking.

The Ice Lake Trail was wet and muddy this morning from the very recent rainstorm.

Wet Ice Lake Trail

Red Cliff & Clouds

Red Cliff & Clouds

Clear Creek Waterfall

Clear Creek Waterfall/>

Twin Sisters in the Clouds

Twin Sisters

On my previous visit I had skipped the lower portion of the trail, instead starting higher up along the road to Clear Lake, so this first part of the trail was all new to me.

Through the Trees

Of course, most of the lower portion of the trail was in the trees with limited views, but the few times I could see out of the trees I could see that the clouds were indeed hanging around, which was nice!

Stuck In the Trees

Above the Trail

Above the Trail

Hiking through the rising clouds.

Rising Clouds

As soon as I got out of the trees and made it to the beginning of the Island Lake Loop I had a very nice view of Golden Horn through the clearing clouds.

Golden Horn View

Golden Horn

Golden Horn

I just love these conditions when the constantly-moving clouds are obscuring the surrounding mountains and ridges.

Rock & Clouds

Emerging

It was a lovely morning in the clouds!

Morning In the Clouds

Looking down into Lower Ice Lake Basin as I climbed the trail to Island Lake.

Lower Ice Lake Basin

Clouds in Motion

Clouds in Motion

Obscured Basin

Obscured Basin

I was able to capture a reflection on this shallow tarn.

Shallow Tarn Reflection

I had a very nice overview of Island Lake as I crested the final hill into the basin.

Island Lake Basin

Island Lake

Island Lake

I was originally thinking about hiking up to Swamp Pass before visiting Island Lake, but after not hiking for a few weeks my legs were already starting to get tired and I knew if I went up to the pass I might not make it to Fuller Lake, so I skipped it this time and descended to the shore of the lake.

Island Lake Shore

The Island

The Island

Island Lake Outlet

Island Lake Outlet

U.S. Grant Peak towers over Island Lake.

U.S. Grant Peak

As I followed the trail from Island Lake to Ice Lake, there was a good view down into the upper end of Lower Ice Lake Basin. On my last backpacking trip here I had camped in that group of trees just right of center.

Upper Lower Basin

Fuller Peak hidden in the clouds.

Hidden In the Clouds

Following the Island Lake Trail into Ice Lake Basin.

Island Lake Trail

When I came around the bend I got my first view of Ice Lake.

Ice Lake View

Ice Lake Basin Trail

Ice Lake Basin Trail

Ice Creek

Ice Creek

I reached the shore of the very blue Ice Lake just as the final clouds were burning off.

Ice Lake & Clouds

Ice Lake Reflection

Ice Lake Reflection

Ice Lake Outlet

Ice Lake Outlet

Blue Reflection

Blue Reflection

I was moving quite a bit slower during the climb from Ice Lake to Fuller Lake, but I eventually made it to the shore of Fuller Lake.

Fuller Lake & Fuller Peak

There are some old mining ruins near the outlet of Fuller Lake.

Fuller Lake & Mining Ruins

Fuller Lake Outlet

Fuller Lake Outlet

The trail to Fuller Lake passed by this smaller tarn.

Tarn View

Ice Lake Basin

Ice Lake Basin

Green & Blue

Green & Blue

Rocky Tarn

Rocky Tarn

Pilot Knob

Pilot Knob View

I hiked back past Ice Lake and then started the descent into Lower Ice Lake Basin.

Ice Lake

Ice Lake Basin Trail

Ice Lake Basin Trail Descent

The sky became mostly overcast during the descent back to the trailhead, so the only photo I took on the way down was when a little light lit up Bear Mountain.

Bear Mountain

Even though the trail to Ice Lake and Island Lake was busier than I would have liked, it was not quite as busy as the West Maroon Trail was in late July. Plus, very few people seemed to be taking the spur out to Fuller Lake and I saw almost no one when I was hiking that section of the trail, which was nice. I returned to the trailhead around 1:30pm and had just barely enough time to make it over to the Kendall Mountain Cafe in Silverton for a burger before they closed, which was something I hoped to do this afternoon since it would probably be my only opportunity to make it there this year. After my late lunch I started the drive back home. It was very nice getting back into the mountains after spending the last two weeks in the Midwest.

>> Island Lake Loop to Fuller Lake Photo Gallery

One Comment

  1. Lisa
    Lisa September 25, 2026

    Thank you for sharing the natural beauty of this area! Gorgeous pictures. And good to hear Diane had an easier time

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