The range, which is 200 miles long and 3.5 million acres in size, runs through 12 counties, marked notably by Mount Diablo on ...

WALNUT CREEK — There’s an inherent peril looming behind the estimated 150,000 cyclists who make the climb up Mount Diablo’s steep 3,849-feet summit each year: motorists speeding past them ...

Seven of the endangered birds flew north into Alameda and Contra Costa counties on a circuitous aerial tour on Aug. 18, the conservation group Save Mount Diablo said Monday. The three-hour flight ...