Del Valle Regional Park, Nature preserve in Livermore, United States

Del Valle Regional Park is a nature preserve near Livermore with a large lake and rolling hills across its grounds. The park offers multiple trails for hiking, camping areas, and access to water for recreational activities.

The East Bay Regional Park District built the reservoir in 1968 and opened the park to the public in 1970 as a recreational destination. This early development made it one of the region's important outdoor destinations.

The park forms the eastern gateway to the Ohlone Wilderness Trail, which continues to Sunol and Mission Peak regional parks. The East Shore Trail runs from the Arroyo Road staging area up to a ridge above the lake, then follows the shoreline for several miles to the boat launch. The Sailor Camp Trail connects to the Ohlone Wilderness Trail.

The park has multiple entry points and adequate parking for most visitors. Bring plenty of water and sun protection since many trails are exposed with little shade, especially during warmer months.

Lake Del Valle is an artificial reservoir created in 1968 by damming Arroyo Valle, and the park opened in 1970, 36 years after the East Bay Regional Park District was founded in 1934. The park covers 4,316 acres and serves as the eastern gateway to the 28-mile Ohlone Wilderness Trail toward Sunol and Mission Peak.