When people think of Aspen, Colorado, they often picture world-class skiing, luxury homes, and breathtaking mountain views. But tucked away just behind the Aspen Post Office is one of the area's most incredible hidden gems at Hallam Lake, home to the Aspen Center for Environmental Studies (ACES).
Recently, I had the opportunity to join one of ACES' Sunset Beaver Walks, and it turned out to be one of the most educational and peaceful experiences I've had in Aspen. Whether you're a local, a visitor, or someone considering moving to the Roaring Fork Valley, this is an experience that's well worth adding to your list.
What Is the Aspen Center for Environmental Studies?
Located at the end of Puppy Smith Street, Hallam Lake is a 25-acre nature preserve that was donated by Elizabeth Paepcke in 1968 to permanently protect Aspen's natural environment.
Today, the preserve serves as the headquarters for ACES, a nonprofit organization dedicated to environmental education, wildlife conservation, and connecting people with nature. Their guided tours, educational programs, and community events make Hallam Lake one of Aspen's most unique destinations.
Learning About Nature's Greatest Engineers
Orange Beaver Teeth and Wood Carving by Beavers
Before setting out on the trail, our naturalist guides shared fascinating facts about North America's largest rodent - the beaver. I learned several things I never knew before:
- Beavers were nearly hunted to extinction in North America, with populations dropping to only about 10,000–15,000 animals.
- They had already become extinct throughout much of Europe.
- Their distinctive orange teeth never stop growing, requiring them to constantly chew wood to keep them at a healthy length.
- Beaver lodges contain multiple living areas, including places for eating, grooming, and raising their young.
- It's no surprise that beavers are often called nature's engineers.
Beaver Home Across Hallam Lake
Why Beavers Matter More Than Ever
Wetland Habitat Created by Beavers
One of the most interesting lessons from the tour was learning how valuable beavers are to Colorado's ecosystem. By building dams, beavers slow moving water and create wetlands that benefit countless species of wildlife. These wetlands also retain moisture in the landscape, making nearby vegetation healthier and more resilient during dry conditions.
With wildfires becoming more common across Colorado and the West, these naturally created wetlands can even help reduce fire intensity by keeping surrounding areas wetter throughout the season. It's amazing how one species can have such a significant impact on an entire ecosystem.
Wildlife Around Hallam Lake
Deer on Hallam Lake
Although beavers tend to stay away from people, we still observed plenty of evidence of their activity. We spotted:
- Active beaver lodges
- Beaver feeding areas
- Beaver trails leading into the water
- A beaver swimming across Hallam Lake
- Deer grazing throughout the preserve
- Families of ducks and geese
- Beautiful wetland habitats filled with native vegetation
Geese on Hallam Lake
ACES is also home to several birds of prey, including a rescued Red-tailed Hawk and a Golden Eagle that can no longer survive in the wild after suffering injuries.
The preserve truly offers an incredible opportunity to observe Colorado wildlife without leaving downtown Aspen.
An Incredible Aspen Sunset
The evening ended with one of the most dramatic sunsets I've seen in quite some time.
Smoke from regional wildfires created deep reds and oranges across the sky, reflecting beautifully over Hallam Lake. While the conditions that caused the colorful sunset are unfortunate, the scenery made for an unforgettable evening and highlighted just how important healthy wetlands are for our environment.
Aspen Real Estate Around Hallam Lake
Red Mountain Homes in the Distance
Since I also specialize in Aspen real estate, I couldn't help but point out some of the beautiful homes surrounding Hallam Lake.
West End Home Overlooking Hallam Lake
Properties on nearby Red Mountain and in portions of the West End occasionally enjoy views overlooking the preserve. These homes are among Aspen's most desirable, offering the rare combination of privacy, natural beauty, and close proximity to downtown.
While lake-view properties are limited, they represent some of the most unique real estate opportunities in Aspen.
Why You Should Visit Hallam Lake
Whether you're passionate about wildlife, photography, hiking, or simply looking for something different to do in Aspen, the Sunset Beaver Walk is an unforgettable experience. The knowledgeable guides, peaceful walking trails, incredible wildlife, and beautiful scenery make this one of the best activities in town.
It's a reminder that some of Aspen's greatest treasures aren't found on the ski slopes, they're hidden in the quiet corners of nature. If you're visiting Aspen, I highly recommend booking one of the guided naturalist tours through the Aspen Center for Environmental Studies. And if you're considering buying or selling a home in Aspen, Snowmass, or anywhere throughout the Roaring Fork Valley, I'd be happy to help you explore the area's unique neighborhoods and lifestyle.
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If you enjoyed this article, be sure to share it with fellow nature lovers, and let me know in the comments—have you ever seen a beaver in the wild?