Flooding remains an ongoing concern in parts of Siskiyou County, particularly in areas like Scott Valley and Fort Jones.

In the mid-1800s, the U.S. Department of the Interior began the “great surveys” to map the vast, uncharted land of the West, ...

A team of USGS researchers in Flagstaff are working to develop an all new geologic map of the Grand Canyon region.

There are 11 counties that share their names with California rivers — Sacramento, San Joaquin, Stanislaus, Calaveras, ...