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: 139
Date published: November 29, 2016

Large-scale streamflow experiments

Because the underlying cause of riparian system alteration is often attributed to the effects of dams on flow regime, managing flow releases, particularly high flows, from dams is an often-advocated approach to river and riparian restoration. Our work has focused on understanding effects of managed high flow releases (a.k.a., pulse flows, controlled floods) from dams along rivers in the lower...

Date published: November 28, 2016
Status: Active

Biological Invasions of Riparian Ecosystems

Beginning in the early twentieth century, non-native trees and shrubs, including tamarisk (also commonly known as saltcedar) and Russian-olive, were introduced to the United States for use as ornamental plants and in erosion-control plantings. These plants spread extensively, becoming the third and fourth most frequently occurring woody riparian plants in the American West.

 

Date published: November 28, 2016

Streamflow-fluvial Geomorphology-riparian Vegetation Interactions

The foundation for applying science to river and riparian restoration contexts lies in a basic understanding of the factors that drive riparian vegetation dynamics. Much of our research is focused on clarifying relationships between streamflow, fluvial geomorphology, and riparian vegetation, including various feedbacks.

Date published: November 21, 2016

Status and Breeding Ecology of the Arizona Grasshopper Sparrow

The Arizona Grasshopper Sparrow (Ammodramus savannarum ammolegus) is a disjunct race that breeds in desert grasslands of southeastern Arizona, extreme southwestern New Mexico, and adjacent parts of northern Sonora and Chihuahua, Mexico.

Date published: September 23, 2016
Status: Active

The New Mexico Landscapes Field Station

The New Mexico Landscapes Field Station is a place-based, globally-connected, ecological research group that studies and interprets ecosystem and wildlife dynamics, working with land managers and community leaders to deliver solutions that foster the linked health of human and natural systems.

Our partnerships, and co-location, with land management agencies provide us with opportunities...

Date published: September 21, 2016
Status: Active

External Microbiota of Bats as Potential Bio-control Against Wildlife Diseases

White-nose syndrome (WNS) and/or Pseudogymnoascus destructans (P.d.), the causal agent, has spread westward across 26 states and 5 provinces within the eastern United States and Canada, respectively, over a short period of time. Since its discovery there has been a search to stop the spread of this disease that has killed millions of hibernating bats in its wake. Recent collaborative work by...

Date published: September 20, 2016

Post-fire Recovery Patterns in Southwestern Forests

High-severity crown fires in Southwestern dry-conifer forests — resulting from fire suppression, fuel buildups, and drought — are creating large treeless areas that are historically unprecedented in size. These recent stand-replacing fires have reset extensive portions of Southwest forest landscapes, fostering post-fire successional vegetation that can alter ecological recovery trajectories...

Contacts: Collin Haffey
Date published: August 30, 2016

New Mexico Dendroecology Lab

Using tree ring analysis as a primary research tool, we conduct landscape-scale ecological research that focuses on the effects of climate variability on forest ecology, fire ecology, and ecohydrology. 

We are the only tree-ring lab in New Mexico, working in close collaboration with Bandelier National Monument and Emeritus Regents’ Professor Dr. Thomas Swetnam.  However, we were not the...

Date published: August 29, 2016
Status: Completed

Study Reveals Processes that Control Uranium Bioavailability in a Freshwater Snail—Relevance to Aquatic Biota in the Grand Canyon Area

Scientists refined an existing speciation model to identify key biogeochemical processes controlling dissolved uranium bioavailability to a freshwater snail. This information is important to advance current understanding and prediction of the ecological risk posed by uranium mining to freshwater ecosystems, including federally managed lands such as in the Grand Canyon area.

Date published: August 1, 2016

Ecology of Insect-eating Bats

Bats are the only flying mammals that are active mostly at night and occur on all continents except Antarctica. Bats are ecologically diverse, with a range of species that specialize in feeding on fruit, nectar, blood, fish, small mammals, and insects. However, of the more than 1,100 known species of bats on Earth, the majority specialize in feeding on insects. In the United States for example...

Date published: July 26, 2016
Status: Active

HDgov: Multi-agency Website for Human Dimensions of Natural Resources

HDgov is an interactive and mobile-responsive online portal to interagency, academic, and non-government resources focused on the human dimensions of natural resource management. The web portal provides easy access to tools, publications, data, and methods that help ensure that the people side of natural resources is considered throughout the entire natural resource management process. The...

Date published: July 26, 2016
Status: Active

National Park Service Visitor Spending Effects

The National Park Service (NPS) manages the Nation’s most iconic destinations that attract millions of visitors from across the Nation and around the world. Trip-related spending by NPS visitors generates and supports a considerable amount of economic activity within park gateway communities. USGS economists collaborate with the National Park Service social science program to estimate NPS...

Filter Total Items: 126
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Year Published: 1977

Annual summary of ground-water conditions in Arizona, spring 1976 to spring 1977

Two small-scale maps of Arizona show (1) pumpage of ground water by areas and (2) the status of the ground-water inventory in the State. The main map, which is at a scale of 1:500,000, shows potential well production, depth of water in selected wells in spring 1977, and change in water level in selected wells from 1972 to 1977. The brief text that...

Babcock, H.M.
Annual summary of ground-water conditions in Arizona, spring 1976 to spring 1977; 1977; WRI; 77-106; Babcock, H. M.

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Year Published: 1976

Annual summary of ground-water conditions in Arizona

Babcock, H.M.
Annual summary of ground-water conditions in Arizona; 1976; WRI; 76-59; Babcock, H. M.

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Year Published: 1976

Water resources of lower Colorado River-Salton Sea area as of 1971; summary report

McDonald, C.C.; Loeltz, Omar J.
Water resources of lower Colorado River-Salton Sea area as of 1971; summary report; 1976; PP; 486-A; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; McDonald, C. C.; Loeltz, O. J.

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Year Published: 1973

Geohydrology of the Needles area, Arizona, California, and Nevada

Metzger, D.G.; Loeltz, Omar J.
Geohydrology of the Needles area, Arizona, California, and Nevada; 1973; PP; 486-J; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; Metzger, D. G.; Loeltz, O. J.

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Year Published: 1973

Geohydrology of the Parker-Blythe-Cibola area, Arizona and California

Metzger, D.G.; Loeltz, Omar J.; Irelan, Burdge
Geohydrology of the Parker-Blythe-Cibola area, Arizona and California; 1973; PP; 486-G; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; Metzger, D. G.; Loeltz, O. J.; Irelan, Burdge

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Year Published: 1973

Geohydrology of the Yuma area, Arizona and California

Olmsted, F.H.; Loeltz, Omar J.; Irelan, Burdge
Geohydrology of the Yuma area, Arizona and California; 1973; PP; 486-H; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; Olmsted, F. H.; Loeltz, O. J.; Irelan, Burdge

Filter Total Items: 225
March 10, 2011

Seepage Investigation: Clear Creek and Little Colorado River

Stream gaging occurring in Winslow: Clear Creek and Little Colorado River.

September 8, 2010

Grand Falls

Flooding taking place at Grand falls.

Image: Smoke From Schultz Pass Forest Fire, Flagstaff, Arizona, June 20, 2010
June 20, 2010

Smoke From Schultz Pass Forest Fire, Flagstaff, Arizona, June 20, 2010

Panorama (180 degree field of view) photograph of smoke rising from the Schultz Pass fire near Flagstaff, Arizona, at 1:34 p.m. on its day of ignition, June 20, 2010.  Over the following 10 days, the fire burned an estimated 15,075 acres, or more than 23 square miles of northern Arizona forest, and cost more than $8.6 million to fight. The fire was started by a campfire

...
Image: Grand Canyon Investigations: 131 Years in the Field
April 12, 2010

Grand Canyon Investigations: 131 Years in the Field

Staff at the USGS Central Region Library created two displays for an open-house in celebration of National Library Week, April, 2010. This display on USGS scientific investigtations of the Grand Canyon displays field records, historical photography,historical surveying equipment, and publications from the science areas of biology, geology, geography, and water.

Image: Saguaro National Park, East Unit, Southern Arizona - 2010
March 29, 2010

Saguaro National Park, East Unit, Southern Arizona - 2010

Saguaro National Monument is now Saguaro National Park. The decline is saguaros has continued but at a rate slightly less steep than predicted. Very few of the saguaro present in 1935 remain. Meanwhile, the regeneration of this forest has already begun, as shown by findings from a long-term study-plot located at left midground. There has been a sharp increase in

...
Attribution: Land Resources
March 21, 2010

Explaining Flood Measurements

Explaning why USGS streamgagers make discharge measurements.

March 21, 2010

Measuring Low Flow in San Pedro River

Measuring low flow in the San Pedro River with flume.

January 27, 2010

Streamflow Measurement, Pinto Creek, AZ (Jan 2010)

USGS streamgagers, Mike Sanders, Arthur Rees, and Mike Schilling, are servicing the Pinto Creek near Miami, Arizona streamflow gaging station and making a streamflow measurement on January 28, 2010. Flow was measured to be 207 cubic feet per second (CFS) on the 28th but peaked earlier on the 22nd at an estimated 7,400 cfs. Debris from the flood flow can be seen in trees

January 21, 2010

USGS Measurement, Salt River (January 2010 )

USGS streamgagers, Mike Sanders and Henry Sanger are servicing the, Salt River near Roosevelt, Arizona streamflow gaging station and making a streamflow measurement on January 22, 2010. Flow was measured to be 44,500 cubic feet per second (CFS) on the 22th but peaked earlier on the 22nd at an estimated 88,000 cfs. The measurement was made from the cableway just downstream

January 21, 2010

Streamflow Measurement, Rillito Creek AZ (Jan 2010)

USGS employees, John Hoffmann, Corey Salmond, Robert Fritzinger, and Chris Smith are being interviewed by Naomi Pescovitz from KVOA on January 22, 2010. Robert Fritzinger and Corey Salmond are making a streamflow measurement at Rillito Creek at La Cholla BLVD near Tucson streamflow gaging station. The updated peak was 1,360 cubic feet per second (CFS) on January 22, 2010.

Image: Jurassic Rocks in Arizona
January 1, 2010

Jurassic Rocks in Arizona

Gordon Haxel (USGS, Flagstaff) explains the Jurassic geology of the Baboquivari Mountains, Arizona. Kitt Peak, Arizona, November 2009. Bob Powell (USGS, Tucson) holds the map.

Image: Mine Blast at Silver Bell Mine, Arizona
January 1, 2010

Mine Blast at Silver Bell Mine, Arizona

Mine Blast at Silver Bell Mine, Arizona.

Filter Total Items: 187
USGS science for a changing world logo
February 12, 2009

Astrogeologists at the U.S. Geological Survey in Flagstaff provided critical datasets used in the latest release of Google Earth. The updated software enables users to explore Mars in high detail.
"Without the ability to accurately co-align data sets, applications like Google Earth would not be nearly as useful," said Trent Hare, a GIS expert with the USGS Astrogeology Team.

USGS science for a changing world logo
December 18, 2008

Dr. Julio Betancourt, a U.S. Geological Survey senior scientist, was recently awarded a prestigious 2008 Presidential Rank Award. Betancourt, who has conducted groundbreaking research in how climate variability affects ecosystems, is also an adjunct professor at the University of Arizona, where he received his graduate degrees.

 

USGS
October 9, 2008

Local planetary geologist Chris Okubo is on a mission to understand the past roles of groundwater and faulting on Mars by studying similar locations on Earth.  Okubo works in the Astrogeology Research Program for the U.S. Geological Survey (USGS) in Flagstaff.

USGS
June 17, 2008

Long-term trends in landscape conditions have significantly reduced sagebrush habitat and populations of greater sage-grouse, according to a new study examining the bird's chances of survival.

USGS
April 21, 2008

The Upper San Pedro Partnership was recognized with the Department of the Interior's Cooperative Conservation Award today.

USGS
April 7, 2008

Time lapse videos of sandbars from the Glen Canyon Dam high flow experiment have been released by the U.S. Geological Survey (USGS).

USGS
March 18, 2008

Competition for water is becoming more intense as the nation's population continues to grow, increasing the demands for water use in agriculture and power production.

USGS
March 13, 2008

A report published by the U.S. Geological Survey (USGS) contains a regional map and associated database that inventory 121 locations of reported natural asbestos and fibrous amphibole occurrences in the Southwestern United States, including Arizona, Nevada, and Utah.

USGS
February 29, 2008

Salt Lake City - The Bureau of Reclamation today released a final environmental assessment (FEA) and a Finding of No Significant Impact (FONSI) that authorizes the initiation of an early-March 2008 high-flow test and fall steady flow experiment from Glen Canyon Dam downstream through the Grand Canyon

USGS
February 25, 2008

The Department of the Interior has proposed an experiment using high flows from Glen Canyon Dam to study and improve Colorado River resources in Grand Canyon National Park.

USGS
January 30, 2008

Where in Arizona are ground-water levels falling? Where are they stable or rising? How much has the water table changed since large-scale pumping has occurred? 

USGS
January 17, 2008

(Flagstaff, Ariz.) An experiment using high flows from Glen Canyon Dam to study and improve Colorado River resources in Grand Canyon National Park has been proposed by the Department of the Interior.