Del Valle Regional Park is part of the East Bay Regional Park District (EBRPD) in the unincorporated area of Alameda County , California, 10 miles (16 km) south of the city of Livermore. The park is 4.316 acres (~17.47 km2). The park is largely surrounded by Lake Del Valle, an artificial reservoir created in 1968 by the dam of Arroyo Valle, a small river. The lake is a center of leisure for tourists, including swimming , fishing and boating. Lifeguards are available in designated swimming areas.

In addition to 150 camping areas, the park also provides 28 miles (~45.1 km) of hiking, horseback riding and cycling trails. It is the eastern entrance to the Ohlone Wilderness Trail, which leads to the Sunol and Mission Peak Regional Parks.

Deep in a valley surrounded by oak-covered hills, with sailboats and sailboards hovering over its waters, Del Valle is like a lakeside resort just 10 miles south of Livermore.

The centerpiece of the park is a lake five miles long with a range of water-based recreation, from swimming to windsurfing and boating, surrounded by 4,395 acres of spectacular land for hiking, horseback riding and nature research. Del Valle is also the eastern entrance to the Ohlone Wilderness Trail, 28 miles away from the scenic backcountry trail.

Lake Del Valle is renowned for its excellent fishing. The lake is periodically stocked with trout and catfish. There's also big-and small-mouth bass, striped bass, and panfish.

The park, like many of the East Bay Regional Parks, has a variety of trails. One track, the East Shore Track, leads from the Arroyo Road staging area to the ridge above Del Valle, and then follows the lake for a few miles to the launch of the ferry. The Sailor Camp Trail takes you to the Ohlone Wilderness Trail, and the unidentified trail leads to Mendenhall Lane. Most of the trails ascend hills around the lake, but most of them remain between 500 and 1500 feet (150 to 460 m) in altitude.

To Reach The Park

• Main entrance: Del Valle Regional Park is located on Del Valle Road off Mines Road south of Livermore (parking fee). Exit I-580 eastbound or westbound in Livermore at North Livermore Avenue. Head south and proceed through town (North Livermore Avenue will become South Livermore Avenue in town). About 1.5 miles outside of town, turn right at Mines Road, go about 3.5 miles and continue straight on Del Valle Road (Mines Road goes left). The park entrance is about four miles ahead.
• Arroyo Road Staging Area: From I-580 in Livermore, exit at North Livermore Avenue. Drive south on North Livermore Avenue. Turn right at Portola Avenue, then left on North L Street. North L Street becomes South L Street, then Arroyo Road. Continue on Arroyo Road past the entrance to the U.S. Veterans Administration Hospital and Sycamore Grove Park. The staging area is on the left at the end of Arroyo Road (No parking fee).