It will take time for rangers to fully assess parks, including backcountry areas, and more damage could yet be discovered, said Kristen Brengel with the National Parks Conservation Association.
Shutdowns can end overnight -- but a government can't reopen that fast
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More than a quarter of national parks, many of them historical sites, are closed because they have gates that can be locked, while larger parks that don't have gates remain effectively open to the public, Kristen Brengel, senior vice president of the National Parks Conservation Association, which works to protect national parks, said.
Groups step up to help reopen national park sites and welcome visitors
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