So few people hike the Grand Canyon that they're known as "one-percenters." But if you've studied the climate and concluded that spring or fall are perfectly safe for Grand Canyon trekking ...

Grand Canyon Trust, a non-profit dedicated to safeguarding ... effectively eliminates the possibility of contaminating the Redwall-Muav aquifer.' Uranium is a naturally occurring radioactive ...

GRAND CANYON NATIONAL PARK, Ariz. – A chlorine gas leak at Grand Canyon National Park’s main water supply has forced park officials to close all inner canyon corridor trails. Officials said ...

The closure also means the end of REI's Signature Camps, including one that was planned to open this spring near Grand Canyon National Park, REI spokesperson Megan Behrbaum told The Arizona Republic.

Grand Canyon National Park announced April 9 that it’s extending closures of multiple inner canyon areas for planned maintenance. The facilities, which were expected to open this spring and are ...

Dozens of hikers say they fell ill during trips to a popular Arizona tourist destination that features towering blue-green waterfalls deep in a gorge neighboring Grand Canyon National Park.