Expect Isolated Showers and Thunderstorms Friday, with Increasing Chances Over the Weekend
Monsoonal weather patterns have moved into the Grand Canyon area decreasing fire danger. As a result, on Tuesday, July 8 at 8 a.m. fire managers lifted fire restrictions within Grand Canyon National Park. More »
Two Bats Collected in the Park Have Tested Positive for Rabies
One on the North Kaibab Trail and the other at Tusayan Ruin/Museum. Rabies can be prevented if appropriate medical care is given following an exposure. Any persons having physical contact with bats in Grand Canyon National Park, please follow this link. More »
Exotic Tamarisk Management
The impacts caused by tamarisk in the southwest are well documented. These prolific non-native shrubs displace native vegetation and animals, alter soil salinity, and increase fire frequency. Salt cedar is an aggressive competitor, often developing monoculture stands and lowering water tables, which can negatively affect wildlife and native vegetative communities. In many areas, it occupies previously open spaces and is adapted to a wide range of environmental conditions. Once established in an area, it typically spreads and persists.
Through a public review process, called an Environmental Assessment / Assessment of Effect, park management evaluated the impacts to natural, cultural and wilderness resources, and solicited public comments. Through this process the environmentally preferred alternative was selected, and includes the control of tamarisk in side canyons, tributaries, developed areas, and springs above the pre-dam water level of the Colorado River within Grand Canyon National Park.
Crews remove tamarisk through a combination of mechanical and chemical controls, allowing for native vegetation to recover. The size of the plant usually dictates how it is removed. Methods include pulling, cutting to stump level, or girdling it to leave the dead tree standing for wildlife habitat. The combination of hand tools and herbicide ensures maximum effectiveness with minimum impact to visitors and the environment. The particular method used is specific to each site and determined by the restoration biologist or on-site project leader.
Reports and Documents
Download the Tamarisk Site Bulletin
Tamarisk Management and Tributary Restoration March 2011 (240 kb PDF File)
Download the Tamarisk Program Overview Poster
Vegetation Management Bulletin (117 kb PDF File)
Download the Tamarisk Eradication and Tributary Restoration Project Reports
Phase II-A Final Report 2007 (1.50 MB PDF File) Management & Control of Tamarisk and Other Invasive Vegetation at Backcountry Seeps, Springs and Tributaries in Grand Canyon National Park
Phase II-B Final Report 2008 (2.5 MB PDF File) Management & Control of Tamarisk and Other Invasive Vegetation at Backcountry Seeps, Springs and Tributaries in Grand Canyon National Park
Download the Finding of No Significant Impact - July 2002
FONSI Tamarisk Management and Tributary Restoration (212 kb PDF File)
Download the Environmental Assessment - February 2002
Colorado River Plant List (280kb Excel Worksheet)
Canyon Sketches Vol 16 - January 2010
Canyon Sketches Vol 06 - October 2008
Did You Know?
The more recent Kaibab limestone caprock, on the rims of the Grand Canyon, formed 270 million years ago. In contrast, the oldest rocks within the Inner Gorge at the bottom of Grand Canyon date to 1.84 billion years ago. Geologists currently estimate the age of Earth at 4.5 billion years.