Unified Interior Regions

Arizona

The Southwest Region includes California, Nevada, and Arizona. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

Filter Total Items: 229
July 28, 2006

Flooding in Tucson, AZ (2006)

Measuring floods in Tucson, AZ 2006.

Small tress re-growing after a fire
April 22, 2006

Nonnative tamarisk re-grows following a wildfire

Nonnative tamarisk is resistant to wildfire, in part because of its ablity to re-sprout.

Shrubs re-sprout after a wildfire
April 22, 2006

Nonnative tamarisk re-sprouts after wildfire

Nonnative tamarisk is resistant to wildfire, in part due to its ability to resprout

A tamarisk plant with many pink flowers
April 22, 2006

Tamarisk plants can make many flowers

Tamarisk plants have been sucessful in southwestern US river- and stream-side habitats, in part because of its ablity to make many flowers and, therefore, seeds.

Tamarisk growing along a river
April 22, 2006

A single species stand of nonnative tamarisk

Single species stand of nonnative tamarisk on the Lower Colorado River at Cibola National Wildlife Refuge, California

February 23, 2006

PubTalk 2/2006 — Science and Natural Resources along La Frontera

By Floyd Gray, Geologist

  • Natural systems-water, geology, and wildlife-tend to cross the 1,900- mile-long arbitrary political border between Mexico and the U.S.
  • Rapid population growth on the U.S. side and in Mexican border cities is creating a variety of environmental, ecological, and human health problems
  • The San Pedro River
Poster composed of photographs and text.
December 31, 2005

Flying Eyeball Measures Grand Canyon Sand

Large-scale poster describing USGS work.

USGS scientists needed a better way to measure river sand in the Grand Canyon. Traditionally, scientists used a bucket to get about 75 sand samples on each trip, which were analyzed weeks later in a lab.

To measure more locations and to speed up the analysis, we developed the Flying Eyeball underwater microscope.

...
Hydrologist sampling for sediment and turbidity, Little Colorado River, Grand Canyon
December 31, 2005

Hydrologist sampling for sediment and turbidity, Little Colorado River

Here, a U.S. Geological Survey (USGS) hydrographer is collecting a suspended-sediment water sample from the Little Colorado River, a kilometer upstream from the Little Colorado River, Grand Canyon, Arizona, USA. To gain knowledge of the suspended-sediment characteristics of the entire river (water quality can vary greatly across a river), suspended-sediment water samples

...
Attribution: Water Resources
August 22, 2005

Flood Measurement on Santa Cruz River (1993 and 2005)

Two historic flood measurements are made on the Santa Cruz River in Tucson, Arizona for the 1993 and 2005 floods.

Image: Drought and Beetle-Killed Piñon Pines in Arizona
May 4, 2005

Drought and Beetle-Killed Piñon Pines in Arizona

Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid some surviving trees. Forest drought stress is highly correlated with mortality from poor growth, bark beetle outbreaks, and high-severity fire.

Attribution: Natural Hazards
Image: Drought and Beetle-Killed Piñon Pines in Arizona
May 4, 2005

Drought and Beetle-Killed Piñon Pines in Arizona

Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid a few surviving trees. Forest drought stress is strongly correlated with tree mortality from poor growth, bark beetle outbreaks, and high-severity fire.

Attribution: Natural Hazards
Image: A Hermit Thrush on the Nest in Arizona
May 1, 2005

A Hermit Thrush on the Nest in Arizona

Hermit thrushes are a songbird species that was strongly affected by plant community changes in mountains because of reduced snowpack and cascading ecological effects, according to a USGS Montana Cooperative Wildlife Research Unit study.

Attribution: Ecosystems
Filter Total Items: 191
USGS science for a changing world logo
November 19, 2004

The Department of the Interior’s U.S. Geological Survey is collaborating with partner agencies to conduct scientific experiments designed to evaluate the effect of a high-flow release from Glen Canyon Dam on the natural resources of the Colorado River in Grand Canyon National Park.

USGS
November 19, 2004

The Department of the Interior’s U.S. Geological Survey is collaborating with partner agencies to conduct scientific experiments designed to evaluate the effect of a high-flow release from Glen Canyon Dam on the natural resources of the Colorado River in Grand Canyon National Park.

USGS science for a changing world logo
November 17, 2004

WASHINGTON — The Department of the Interior has proposed conducting a scientific study on the use of high flows from Glen Canyon Dam to improve Colorado River natural and cultural resources in Grand Canyon National Park.

USGS
November 17, 2004

WASHINGTON — The Department of the Interior has proposed conducting a scientific study on the use of high flows from Glen Canyon Dam to improve Colorado River natural and cultural resources in Grand Canyon National Park.

USGS
May 27, 2004

A group of federal and university scientists today announced the launch of the Western Mountain Initiative, a 5-year effort funded by the U.S. Geological Survey (USGS) to better understand ongoing changes in the mountains of the western United States.

USGS science for a changing world logo
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS science for a changing world logo
August 8, 2003

Wesley Ward has been named Regional Executive for Geology for the Western Region of the U.S. Geological Survey (USGS). The announcement of Ward’s new appointment was made by John D. Buffington, Western Regional Director, effective Aug. 11, 2003.

USGS science for a changing world logo
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River. The sun has disappeared long ago from the steep canyon walls, and nighttime temperatures hang at a cool 40 degrees Fahrenheit.

USGS
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River.

USGS
February 14, 2003

Not long ago, conventional wisdom was that you couldn’t predict the climate for more than a few days in advance. Then came the awareness of El Niño and La Niña and the forecast window increased to as much as 6 to 9 months, depending on the region and season.

USGS science for a changing world logo
December 15, 2002

Surface water in the form of ice exposed near the edge of Mars’s southern perennial polar cap has been discovered for the first time, according to U.S. Geological Survey (USGS) research released today in the journal Science. There is evidence that the surface water ice in this region may be widespread - from a half-mile to six miles around the entire southern polar ice cap.