Del Valle Regional Park

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Del Valle Regional Park
Lake Del Valle, Near Livermore, California (10753667465).jpg
Del Valle Regional Park and Lake
LocationAlameda County, California
Nearest cityLivermore, California
Area4,316 acres
Operated byEast Bay Regional Parks District

Del Valle Regional Park is a part of the East Bay Regional Park District (EBRPD) in an unincorporated region of Alameda County, California, 10 miles (16 km) south of the city of Livermore. [1] The park covers 4,316 acres (~17.47 km2., ~6.74 sq. mi.). [1]

East Bay Regional Park District

The East Bay Regional Park District (EBRPD) is a special district operating in Alameda County and Contra Costa County, California, within the East Bay area of the San Francisco Bay Area. It maintains and operates a system of regional parks which is the largest urban regional park district in the United States. The administrative office is located in Oakland.

Alameda County, California County in California

Alameda County is a county in the state of California in the United States. As of the 2010 census, the population was 1,510,271, making it the 7th-most populous county in the state. The county seat is Oakland. Alameda County is included in the San Francisco Bay Area, occupying much of the East Bay region.

Livermore, California City in California, United States

Livermore is a city in Alameda County, California, in the United States. With an estimated 2017 population of 89,648, Livermore is the most populous city in the Tri-Valley. Livermore is located on the eastern edge of California's San Francisco Bay Area. The incumbent Mayor of Livermore is John Marchand.



General Description

The park largely surrounds Lake Del Valle, an artificial reservoir made in 1968 by damming Arroyo Valle, a small river. The lake provides a source of recreation for visitors including swimming, fishing, and boating. There are lifeguards present at designated swimming areas.

Lake Del Valle is a storage reservoir located 10 miles (16 km) southeast of Livermore, in Alameda County, California. It is within Del Valle Regional Park.

Arroyo Valle river in the United States of America

Arroyo Valle or Arroyo Del Valle is a 36.4-mile-long (58.6 km) westward-flowing stream that begins in northeastern Santa Clara County, California, and flows northwesterly into Alameda County where it is dammed to form Lake Del Valle. After that Arroyo Valle is tributary to Arroyo de la Laguna which in turn flows into Alameda Creek and thence to San Francisco Bay. In the past, the Arroyo Valle had a significant steelhead migration; however, degradation of the stream in the latter half of the 20th century has decimated this anadromous fish population.

The park also offers 28 miles (~45.1 km) of hiking, horseback, and bicycle trails, in addition to 150 camping sites. It is the eastern gate for the Ohlone Wilderness Trail, which leads to Sunol and Mission Peak Regional Parks. [1]

Sunol Regional Wilderness regional park

The Sunol Regional Wilderness is a regional park in Alameda County, the eastern San Francisco Bay Area, Northern California. It is located near the town of Sunol, south of Pleasanton and east of Fremont.


The park, like many East Bay Regional Parks, has numerous trails. One trail, the East Shore Trail, leads from the Arroyo Road staging area to a ridge above Del Valle, and then follows the lake for several miles toward the boat launch. The Sailor Camp Trail leads to the Ohlone Wilderness Trail, and an unnamed trail leads to Mendenhall Road. Most of the trails climb hills around the lake; most, however, stay between 500 to 1,500 feet (150 to 460 m) in elevation. [2]

Slipway ramp on the shore by which ships or boats can be moved to and from the water

A slipway, also known as boat ramp or launch or boat deployer, is a ramp on the shore by which ships or boats can be moved to and from the water. They are used for building and repairing ships and boats, and for launching and retrieving small boats on trailers towed by automobiles and flying boats on their undercarriage.

Access to the park

By car

The park can be approached from Del Valle Park Road (via Mines Road) or Arroyo Road, where the parking meter is often broken. Del Valle Road connects to the southern end of the park, while Arroyo Road connects to the northern staging area.

Mines Road can be reached from Tesla Road (J2) and the California State Route 130. Arroyo Road can be reached from Concannon Boulevard and Wetmore Road.

California State Route 130 highway in California

State Route 130 is a state highway in the U.S. state of California that runs from U.S. Route 101 in San Jose to Mount Hamilton. Much of its length goes through the Diablo Range as Mount Hamilton Road, where it is a narrow two-lane highway. The remainder of SR 130 is numbered along Alum Rock Avenue in San Jose.

By foot

You can reach the Arroyo staging area along a narrow footpath which connects to Sycamore Grove Park and the general LARPD (Livermore Area Recreation and Park District) trail network. [3]

Lake Del Valle in Livermore.jpg
panoramic view at Del Valle Regional Park near Livermore


Early years

Construction crews began work on the lake in 1966. [4] The construction of Del Valle Reservoir was finished in 1968. [5] Del Valle Regional Park was opened to the public in 1970, [6] 36 years after the EBRPD was founded in 1934. [7]


California drought in the 2010s

In the early- to mid-2010s, a severe drought struck the California region, including the East Bay; [8] this caused 12 million trees in California to die. The East Bay Regional Park District wrote an article to help with the drought. [9]

Flooding in the 2016-2017 winter

Shortly after the California drought in the 2010s, Del Valle Regional Park suffered widespread damage from the unusually heavy rains and La Niña that struck the East Bay in early 2017. Much of the damage was around Lake Del Valle, where runoff overflowed five times into beaches, campgrounds and picnic areas. Some of the trails were washed out and needed to be rebuilt. The park was closed for nearly three months, before reopening on April 15, 2017. EBRPD estimated the cost to repair this park alone at $1.8 billion, and said the cost would rise further if the rains continued. [10]

With another La Niña scheduled for the 2017-2018 winter, it seemed quite possible that repairs would have to be done after that winter as well. [11]

2019 flooding

In early 2019, heavy rains again came to the Del Valle Regional Park area, and as a result, the park closed in mid-February 2019. It was scheduled to re-open in early March. [12]


Lake Del Valle has in the past had a problem with dangerous algae, and during the 2015/2016 winter, swimming was banned in the lake. [13]

See also

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  1. 1 2 3 Del Valle Regional Park profile, East Bay Regional Park District, retrieved September 1, 2007
  2. "Del Valle Regional Park". Retrieved 2017-12-05.
  3. "LAPRD Trail Network" (PDF).
  4. "Current History Detectives Article". Retrieved 2017-12-05.
  5. "Del Valle Reservoir". Retrieved 2017-12-05.
  6. "Del Valle Map Text Side" (PDF).
  7. "Celebrating Eighty Years of Regional Parks in 2014". Retrieved 2017-12-05.
  8. "California drought: Sour water — a new normal in the East Bay?". SFGate. Retrieved 2017-12-05.
  9. "The Drought and Our Parks". Retrieved 2017-12-05.
  10. Cuff, Denis. "Storms hit parks hard." Bay Area News Group. April 15, 2017. Accessed April 15, 2017.
  11. "La Niña Declared; Cooldown Nipping the Warmest Autumn on Record in Northeast U.S. by Bob Henson | Category 6". Weather Underground. Retrieved 2017-12-05.
  12. News, Bay City. "Del Valle Regional Park in Livermore Closed Due to Flooding". NBC Bay Area. Retrieved 2019-02-17.
  13. Lyons, Jenna (2015-12-09). "Toxic algae close Livermore's Lake Del Valle to swimming". SFGate. Retrieved 2019-04-24.

Coordinates: 37°36′02″N121°42′39″W / 37.600564°N 121.710835°W / 37.600564; -121.710835