Unified Interior Regions


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

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Harrison Schmitt posing with the American Flag during the Apollo 17 mission
December 31, 1972

Harrison 'Jack' Schmitt with the American Flag and Earth (Apollo 17)

Harrison H. Schmitt during the Apollo 17 mission.

David Scott and James Irwin operating Grover
November 1, 1970

Apollo Grover Historical Photo: B1

James Irwin(left) and David Scott(right) training in the Lunar Roving Vehicle training version known also known as the "Grover"

Image: San Carlos River near Peridot, Southern Arizona - 1964
June 4, 1964

San Carlos River near Peridot, Southern Arizona - 1964

Riparian vegetation has increased to the extent of blocking the downstream view. The channel appears to have shifted to the right, and the terrace is now occupied by cottonwood, black willow, and tamarisk. (Raymond M. Turner).

Attribution: Land Resources
Image: Huérfano Butte, Santa Rita Experimental Range, Southern Arizona  - 1941
September 1, 1941

Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 1941

Members of the 1930s burrowed and cholla eruptions were visible in 1941 as well as new mesquite plants that were already quite large. (Photographer unknown).

Attribution: Land Resources
Image: San Carlos River near Peridot, Southern Arizona - 1940
March 21, 1940

San Carlos River near Peridot, Southern Arizona - 1940

In 1940, the gaging station for the San Carlos River was on a railroad bridge south of the little town of Peridot. This downstream view from that bridge shows the gage house on the extreme left and a safety railing next to it. The channel is wide following a flood, and scattered Frémont cottonwood trees are along channel right. The dense shrubs on the low terrace on the

Attribution: Land Resources
Image: Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 1902
April 1, 1902

Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 1902

Ground repeat photography location 233 looking west at Huérfano Butte, at 1,159-meter elevation. In 1902, photographer David Griffiths’ horse-drawn buggy was clearly visible in the open grassland, and scattered desert hackberry plants were behind and on either side of the buggy. (David Griffiths).

Attribution: Land Resources

TNMCorps Mapping Challenge: Fire Stations in CA, NV, AZ as of 02/18/21

TNMCorps Mapping Challenge: Fire Stations in CA, NV, AZ as of 02/18/21

December 19, 2019

Annex PDS Status Classification Chart

The PDS archive status (marked at upper right of each product page, see table) of geospatial data products in the Annex varies, depending on the source and date of delivery to the Annex. Most products are either PDS3 or PDS4 compliant, with the majority served as 8- or 16-bit “raw” GeoTIFFs (meaning uncompressed and untiled, see White Paper below) with detached PDS3 and

Image: Grand Canyon

Grand Canyon

Sun making shadows at the Grand Canyon.

Filter Total Items: 200
March 18, 1997

Following the official dedication Friday morning, March 21, 1997, of the University of Arizona’s new Environment and Natural Resources Building, the public is invited to tour the facility on the campus at the northeast corner of Sixth Street and Park Avenue.

March 18, 1997

You no doubt are already aware of the March 21, 1997 dedication ceremony for the University of Arizona’s new Environmental and Natural Resources building at 520 North Park Avenue in Tucson. The building will be occupied by the U.S. Geological Survey, the U.S. Weather Service, and U of A students.

March 18, 1997

The presence of the U.S. Geological Survey in the University of Arizona’s Environment and Natural Resources Building marks the latest chapter in the USGS’s long association with the University and the study of earth sciences in Arizona.

November 21, 1996

The gasoline additive MTBE (methyl tert-butyl ether) was detected in some urban stormwater samples collected in 16 cities and metropolitan areas by the U.S. Geological Survey, but all detections of MTBE were less than the lower limit of the U.S. Environmental Protection Agency’s draft lifetime health advisory for drinking water.

March 25, 1996

About 2200 pounds of nontoxic red dye will be dumped into the Colorado River Wednesday (Mar. 27, 1996) as part of a controlled flood experiment in the Colorado River in the Grand Canyon, according to hydrologists at the U.S. Geological Survey.

March 22, 1996

Call the U.S. Geological Survey scientists listed below for information about the water science aspects of the controlled flood experiment in the Colorado River, Mar. 22-April 7, 1996. Mark Anderson is the key information scientist for the USGS on-site, and other scientists are working on-site and are available on a limited basis. Still others will be in the USGS office in Tucson throughout the ex

March 22, 1996

Follow the Colorado River Controlled Flood onthe World Wide Web

March 21, 1996

It’s spring and some people are busy cleaning house and rearranging the furniture.

Spring cleaning and rearranging of a different kind will take place in the Grand Canyon next week, as the Colorado River scours its bed and rearranges sandbars that have built up in the river’s winding channel.