San Francisco Bay-Delta
The Bay-Delta is a nexus for challenging issues about water, ecosystems, and human use. USGS science helps address key problems and uncertainties.
Grand Canyon Monitoring and Research Center
How does Glen Canyon Dam affect downstream Colorado River resources?
Lake Tahoe
An underwater view of periphyton growing on rocks near the shore of Lake Tahoe with a reflection of the rocks on the water surface
Salton Sea
The Salton Sea is facing many challenges as inflows and water levels decline. USGS science helps identify problems and evaluate possible solutions.
New Technologies for Mapping Surface Soil Moisture
Coastal Dwellers
Southwest Region
The Southwest Region covers Arizona, California, Nevada, and a portion of southern Oregon. Our scientists do a broad array of research and technical assistance throughout the U.S. and across the globe. The Regional Office, headquartered in Sacramento, provides Center oversight & support, facilitates internal & external collaborations, and works to further USGS strategic science direction.
News
USGS seeking Loma Prieta felt reports from 35-year-old earthquake
Loma Prieta Earthquake 35th Anniversary Compilation
Saline Lake Ecosystems IWAA Fall 2024 Webinar Series
Publications
Bees of the Buenos Aires National Wildlife Refuge—A preliminary report on a bee survey in a vulnerable semi-desert grassland of the Sonoran Desert
Pollinators are vital to the continued existence and seed production of about 87.5 percent of all flowering plants (Ollerton and others, 2011). In the semi-desert grasslands of Buenos Aires National Wildlife Refuge, in the Sonoran Desert of the United States, flowering forbs provide seed vital to the food base of wildlife, including the 136 species of resident and migratory birds using the Refuge’