At least 16 people have died at the park this year, including five fatalities in August alone. No single factor is to blame, but several deaths have followed stretches of extreme weather.
The restrictions will run throughout the Labor Day holiday when hotels are near or at capacity. It's an unprecedented move, even for a waterline that has experienced frequent failures.
In all three cases, no cause of death has yet been released yet. The National Park Service is advising visitors to avoid hiking in the inner canyon during during daytime summer high temperatures.
One person was killed in a tour bus rollover involving over 50 people Tuesday in northern Arizona near the Grand Canyon West Skywalk, authorities said.
