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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Image: Golden Gate Bridge, California

Golden Gate Bridge, California

The Golden Gate Bridge seen through Racoon Strait in the San Francisco Bay, California.

Attribution: Ecosystems
This dark image shows changes in pixels in a video image over 10 minutes.

Santa Cruz Main Beach video camera variance image

Video camera variance image at Main Beach in Santa Cruz, California, looking eastward. Learn more about the cameras and how we're using them to study coastal change.


Whiskeytown National Recreation Area Post-fire Recovery

A landscape at Whiskeytown National Recreation Area 2 months and 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

A view from atop a coastal bluff looking at a sandy beach, waves, and ocean.

Sunset Beach Camera 1 Timex

Video camera timex (time-exposure) image at Sunset State Beach in Watsonville, California, looking northwest. Learn more about the cameras and how we're using them to study coastal change.

Wes Hildreth at Long Valley Caldera...

Wes Hildreth at Long Valley Caldera

Wes Hildreth is an expert when it comes to studying the Long Valley Caldera. Here, he is standing on Tertiary basalt lava flows on the north rim of the caldera, view to the southeast with Lake Crowley visible in the center of the caldera, and McGee Mountain above the lake on the skyline.

Animation shows map of land and sea, land doesn't change and the ocean and bay change colors according to tidal height.
October 2, 2013

San Francisco Bay Basic Tide Model

This compressed data archive contains files that may be used to run a basic depth-averaged (2DH) Deltares (http://www.deltares.nl/en) Delft3D version 4.00.01 astronomic tide model for San Francisco Bay. It was developed with the primary aim of assessing water level fluctuations and flow conditions in the vicinity of