A recent study captures visitor experiences, including use levels, on the Half Dome cables.

What Is the
Half Dome Cables Trail?

Half Dome, one of Yosemite National Park’s most familiar sights, rises more than 4,737 feet above the valley floor. In 1865, this granite dome was considered “perfectly inaccessible,” but thousands of Yosemite hikers now reach the top each year by following a strenuous trail from the Valley floor. The final 400-foot ascent, up the peak's steep east face, follows a pair of metal cables raised on posts that lead to the breath-taking summit. This cable route was constructed in 1919 by the Sierra Club. Following the Half Dome Cables Trail is a unique experience, and it has become one of the most popular hikes in Yosemite National Park.

What Studies Are Taking Place on the Half Dome Cables Trail?

The 2008 studies on the Half Dome Cables Trail will combine computer-based simulation modeling and survey research to understand impacts to the natural environment and social conditions on the trail and help define a baseline for current visitor experience conditions. These studies occurred in July and August, 2008 with an anticipated final product in winter 2009.

The primary objective of the computer modeling will be to understand the connection between the number of people using the trail and the amount of time spent on the cables. Delay times will be collected on the trail as well as time spent at the summit. With these data, the computer model will be able to predict crowding based on people per viewscape and people at one time on the trail. This will provide important baseline data for projections of use of the cables based on the amount of people arriving at the Happy Isles Trailhead.

Survey research will be used to gauge visitor exposure to information, awareness of safety issues, perceptions of crowding, perceptions of risk, and other factors that influence a safe and enjoyable visit. This information will be complemented by other standard survey research questions such as visitor demographics.

A chain of climbers ascend the Half Dome cables.

How Will These Studies Help Park Managers?

Science-based visitor use modeling and social science research will allow park management to better understand preferred visitor experiences, use levels, and safety on the cables as well as on the trail networks leading to the cables. Baseline data are useful in planning for the future of the park, monitoring use over time, and informing park staff about visitor use trends and attitudes. The computer simulation model will allow management to observe a full spectrum of conditions by running hypothetical simulations to understand how use levels may affect social and natural conditions in this region of the park.

• Visit the Half Dome hiking page if you plan to hike the trail.
• Although it's possible to hike Half Dome in a day, some prefer to backpack to Little Yosemite Valley on their way to Half Dome.
• Watch a "Nature Notes" video on Half Dome.
• Watch social scientist Bret Meldrum discuss Half Dome's visitor experience in a "Study the Scientist" video.
• Know the wilderness conditions when planning to hike Half Dome or other peaks. 
• Find out more about geology and rockfall.