grand canyon

National Park Service

Grand Canyon National Park officials plan large prescribed burns on the North Rim that will produce smoke visible from both rims and then inside the canyon itself.

Officials say the burns planned this week will accomplish several purposes, including reducing accumulated potential fuel for wildfires and re-adapting the ecosystem to fire.

Grand Canyon National Park will begin its winter shutdown of most visitors at the North Rim in mid-October.

Emery Kolb, USGS Photographic Library

In 1923, the U.S. Geological Survey sponsored its first expedition on the Colorado River in Grand Canyon. The crew of 12 men was led by topographic engineer Claude Birdseye. Eugene LaRue was hydraulic engineer and chief photographer, and Emery Kolb was head boatman.

Conservationists have asked state officials to deny air-pollution permits for three uranium mines near the Grand Canyon. Arizona Public Radio’s Ryan Heinsius reports, the groups say the mines threaten public health and the environment. 

Mark Henle/The Arizona Republic

The Arizona Department of Environmental Quality has released draft air-pollution-permit renewals for three uranium mines near the Grand Canyon. The agency halted the renewals last year after heightened uranium levels were found in soil. Arizona Public Radio’s Ryan Heinsius reports.