Oak Ridge (California)

Black Mountain, also known as Mount Day, is a mountain in the Diablo Range of eastern Santa Clara County, California, east of Poverty Ridge and Arroyo Hondo, and about 10 miles (16 km) from Milpitas. The peak is one of the highest in area. The northern half of Black Mountain is an oak woodlands while the southern half is barren. Black Mountain can be clearly seen from most parts of the Santa Clara Valley including Sunnyvale, Cupertino, Mountain View and San Jose. The peak is visible from the Mount Hamilton and Monument Peak.

Poverty Ridge is a ridge in unincorporated Santa Clara County, California, east of Milpitas. Calaveras Valley lies to its west, while its east side slopes down to meet Arroyo Hondo. Creeks that originate on Poverty Ridge include Calaveras and Penitencia Creeks.

Rose Peak is a peak in the Diablo Range of California and is the officially listed highest point in Alameda County, though other sources claim the high point is actually nearby Discovery Peak.

Arroyo Hondo is a northwestward-flowing 13.0-mile-long (20.9 km) river in Santa Clara County, California, United States, that lies east of Milpitas. The area is privately owned by the San Francisco Water Department and is closed to public access because of its usage as drinking water. Bounded to the east by Oak Ridge and to the west by Poverty Ridge, Arroyo Hondo empties into the Calaveras Reservoir where it joins Calaveras Creek. It is formed by the confluence of Smith Creek and Isabel Creek which drain the west and east slopes of Mount Hamilton, respectively.

Discovery Peak is a peak in the Diablo Range of California and is the highest point in Alameda County. The officially unnamed peak is also known as Valpe Ridge–Rose Flat due to its location near Rose Flat. The area is high enough to receive occasional snowfall during the winter, which generally melts within a few days of falling. Although it is on private property, the Ohlone Wilderness Trail, in Sunol Regional Wilderness, comes to within about 1 mile (1.6 km) of the summit.

The 2007 Alum Rock earthquake occurred on October 30 at 8:04 p.m. Pacific Daylight Time in Alum Rock Park in San Jose, in the U.S. state of California. It measured 5.6 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong). The event was then the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake, which measured 6.9 on the moment magnitude scale, but was later surpassed by the 2014 South Napa earthquake. Ground shaking from the Alum Rock quake reached San Francisco and Oakland and other points further north. Sixty thousand felt reports existed far beyond Santa Rosa, as far north as Eugene, Oregon.

The Blue Oak Ranch Reserve, a unit of the University of California Natural Reserve System, is an ecological reserve and biological field station in Santa Clara County, California. It is located on 3,260 acres (13.2 km2) in the Diablo Range, northwest of Mount Hamilton, at 1,500 ft (460 m) elevation. The land, part of the 19th century Mexican land grant of Rancho Cañada de Pala, was donated to the University of California on December 1, 2007 by the Blue Oak Ranch Trust, an anonymous benefactor. Overnight accommodations for academic researchers and educational groups may be made by permission only.

Isabel Creek is a 18-mile-long (29 km) perennial stream which flows northwesterly along the eastern then northern flank of Mount Hamilton in Santa Clara County. It joins Smith Creek to form Arroyo Hondo north of Mt. Hamilton and is part of the southernmost Alameda Creek watershed.

Smith Creek is a 14-mile-long (23 km) perennial stream which flows along the western flank of Mount Hamilton in Santa Clara County. The creek begins near Bollinger Ridge, about 7.7 km SxSW of Mount Hamilton.

Los Buellis Hills are a short sub−range of hills in the northwestern Diablo Range, in the South Bay region of the San Francisco Bay Area, within Santa Clara County, California.

Calaveras Valley is a valley east of Milpitas, California in the San Francisco Bay Area. It has formed primarily as a result of the actions of the Calaveras Fault. The southern end of the Calaveras Valley is a few miles south of Calaveras Reservoir, while the northern end is at Sunol. See Calaveras Reservoir for more information.

Sierra Vista Open Space Preserve is a 1,678-acre nature preserve in the eastern foothills of Santa Clara County, California. The preserve is managed by the Santa Clara Valley Open Space Authority and was opened to public in 2002. The only access to the preserve had been from Alum Rock Park until 2014, when a new parking lot and trailhead opened along Sierra Road.