Fifteen years later, when Congress again refused to create a national park, President Theodore Roosevelt stretched the limits of the Antiquities Act and established the Grand Canyon National Monument.

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 ...

Trails in Grand Canyon National Park were closed due to a chlorine gas leak. Chlorine is used as a disinfectant in the Roaring Springs area of the park. The trails have since reopened NORTH RIM ...

All inner canyon trails at the Grand Canyon reopened after a chlorine gas leak at Roaring Springs, the national park said on Thursday afternoon. The chlorine gas leak was reported at Roaring ...