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    New publication highlights natural hazards near Bullfrog, Wahweap areas of Lake Powell

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    Stunning landscapes and a variety of recreational opportunities centered on Lake Powell attract nearly 4.4 million visitors annually to Glen Canyon National Recreation Area; however, the active geologic processes that shaped this rugged landscape can create hazardous conditions for visitors, employees, and infrastructure, according to a statement from the National Park Service.

    Rock falls present natural hazards at Lake Powell
    Rock falls present natural hazards at Lake Powell, according to a new study. Photo courtesy UGS

    To assist the NPA manage and mitigate natural hazards, the Utah Geological Survey completed a geologic-hazard investigation of two high-use sections of the recreation area: a 297-square-mile area near the Bullfrog and Halls Crossing Marinas, and a 117-square-mile area centered on the Wahweap and Antelope Point Marinas near the Utah-Arizona border. 

    Results of this investigation include detailed geologic-hazard mapping that covers flooding and debris flows, rockfalls, landslides, soil erosion and other problem soil and rock hazards, surface faulting, earthquake-induced liquefaction, and indoor radioactive gas (radon) potential.  

      New visitors to Lake Powell might not be fully aware of many of these hazards, particularly rockfall and flash flooding, which are widespread and have caused injuries and fatalities in the recreation area and the surrounding region.

      According to report lead author Tyler Knudsen, “Alcoves make attractive, sheltered places to moor your boat. Unfortunately, they also often produce rockfalls, so the more time spent beneath an alcove, the greater your chance of impact. Additionally, many of Lake Powell’s alcoves lie beneath the hanging mouths of normally dry drainages. These “dry falls” are not always apparent from below until it rains, and potentially damaging waterfalls suddenly plunge to the lake or canyon bottom below.”

      This study provides vital information about geologic hazards on Lake Powell. Education about these geologic features can help boaters recognize signs of rockfall hazard such as abundant rock fractures or cracks and overhanging rock masses, and then avoid these areas as much as possible. 

      Special Study 166 describes the geologic hazards and provides background information on data sources, the nature and distribution of the hazards, and possible hazard-reduction measures. Geologic hazard mapping associated with this study is available on the interactive Utah Geologic Hazards Portal at 

      This work was made possible through the financial and logistical support of the NPS. The Utah Geological Survey, a division of the Utah Department of Natural Resources, provides timely scientific information about Utah’s geologic environment, resources, and hazards, officials say.

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