Pleasanton Ridge Regional Park

Pleasanton Ridge Regional Park is a 5271 acre park in the East Bay Regional Park District overlooking Pleasanton, California and the Livermore Valley to the east. The park is scheduled to grow by almost 1500 acre (sic) with the acquisition of the Tyler Ranch.

History
Pleasanton Ridge Regional Park, located west of the I-680 freeway and the City of Pleasanton, California, became a reality in 1988, when the East Bay Regional Park District bought 1700 acres to start what would become its second-largest park. In 1980, a real estate developer had proposed building a golf course and a number of new homes atop Pleasanton Ridge. A large number of area residents opposed the proposal and defeated it in a referendum in 1983.

In 2012, the park district announced it had purchased 1367 acres from Robertson Ranch, east of Palomares Road, which it would add to Pleasanton Ridge Regional Park. The tract included the landmark Sunol Peak (elevation 2163 feet. The price was reported as $6.2 million. The report stated that prior to the purchase, the regional park contained 7500 acres of land.

Tyler Ranch acquisition
The Tyler Ranch extends for about 3.5 miles along Sunol Ridge. The north end of the ranch abutted the existing Pleasanton Ridge park at the end of Kilkare Road. It also has good access from Foothill Road. The acquisition was supported by the Priem Family Foundation, which is dedicated to preserving open space in the greater Bay Area.

EBRPD claimed that the Tyler Ranch acquisition marked the occasion when the district acquired 100,000 acres since it was formed in 1934.

Trails
Pleasanton Ridge Regional Park contains over 25 miles of trails, most of which are dirt roads, except for the Woodland Trail, the Bay Leaf Trail, and a few sections of the North Ridge and Ridgeline trails. Park elevations range from 400 feet at the main entrance to over 1600 feet at the highest point.

Adjacent to the park is the Augustin Bernal Park.

Geology and Geography
Pleasanton Ridge is the southeastern component of the East Bay Hills, which refers geologically to all of the ranges east of the Bay from the Hayward Fault in the west to the Calaveras Fault in the east. The United States Geological Survey (USGS) Geographic Names Information System, however, includes Pleasanton Ridge as part of the Diablo Range in its list of GPS coordinates for the latter.