Just as a number of shorelines have been issued water advisories and even closures over the Labor Day weekend due to fecal contamination from sewage at most U.S. beaches , one of America's most iconic national parks has set closures of its own—but for a very different, rather unusual reason.

Officials in Rocky Mountain National Park have enforced access bans on several popular hiking trails in a section of the Kawuneeche Valley, along the northeastern end of the Colorado River, whose headwaters are located in the park. They've stayed closed in the week leading up to the Labor Day holiday weekend and over the holiday period itself, which is a particularly busy time for the national park.

But which trails have been closed, and why exactly have officials banned hikers from them, albeit

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