|Location||San Fernando Valley, California|
|Owner(s)||U.S. Army Corps of Engineers, Los Angeles District|
|Dam and spillways|
|Impounds||Los Angeles River|
|Height (thalweg)||57 feet (17 m)|
|Length||2.93 miles (4.72 km)|
|Elevation at crest||725 feet (221 m)|
|Width (crest)||30 feet (9.1 m)|
|Spillway type||Concrete ogee|
|Total capacity||17,300 acre⋅ft (21,300,000 m3)|
The Sepulveda Dam is a project of the U.S. Army Corps of Engineers designed to withhold winter flood waters along the Los Angeles River. Completed in 1941, at a cost of $6,650,561 (equivalent to $115,602,000 in 2019), it is located south of center in the San Fernando Valley, approximately eight miles east of the river's source in the western end of the Valley, in Los Angeles, California.
Sepulveda Dam, along with Hansen Dam located in the north San Fernando Valley, was constructed in response to the historic 1938 floods which killed 144 people. Sepulveda Dam was placed at what was at the time, the current edge of the city. East of the dam the river was crowded into a narrow bottom by the city's growth. One legacy of Sepulveda Dam is its flood control basin, a large and undeveloped area in the center of the Valley, used mostly for wildlife refuge and recreation. But another legacy of the 1938 Los Angeles River flood was the post-World War II channelization of all the Valley's dry washes, which along with the post-World War II rapid suburbanization left the Valley with hot, dry, concrete-lined river bottoms instead of greenbelts. Although now, in part, these are being devolved as interconnecting bike paths.
Behind the dam, the Sepulveda Basin is home to several large recreation areas including Woodley Park, a model aircraft field, The Japanese Garden, a wildlife refuge, a water reclamation plant, and an armory. The Basin is kept free of urban over-building so that water can build up there during a prospective hundred-year flood.
When the 1914 flood caused $10 million in damages to the developing basin areas, a public outcry began for action to address the recurring flooding problems. During the following year, the Los Angeles County Flood Control District was formed. Some of the early flood control efforts included smaller areas of channelization and the planning for needed reservoirs. Taxpayers approved bond issues in 1917 and 1924 to build the first major dams. However, they were not willing to provide enough funding for the much needed and substantial infrastructure downstream of these dams. After two more destructive floods in the 1930s, most notably the 1938 flood, federal assistance was requested. The Army Corps of Engineers took a lead role in channelizing the river and constructing several dams which would create flood control basins behind them. Channelization began in 1938, and by 1960, the project was completed to form the present fifty-one mile engineered waterway. Included in this work were Hansen Dam, completed in 1940 and followed by Sepulveda Dam in 1941. In 1973, Burbank Blvd was built through the Sepulveda Basin, Woodley Ave was also built in the recreation area in 1975.
For 28 years the Sepulveda Dam did its job without incident until 1969 when the Los Angeles River overflowed its banks causing millions of dollars in damage. In 1988 the Los Angeles River's banks were raised to avoid another incident. In 1994 a hundred-year flood occurred in the Los Angeles River. The dam was restored and went without incident for another 11 years until the Los Angeles River again overflowed its banks in 2005.
Sepulveda Basin Recreation Area
Woodley Park is a large city park located on Woodley Avenue between Victory and Burbank Boulevards. The Leo Magnus Cricket Complex, a dog park, and group picnic areas are within the park. The park was opened in 1975.
Lake Balboa Park
Lake Balboa Park, also known as Anthony C. Beilenson Park, is an 80 acres (32 ha) park and water recreation facility with boat rentals and fishing. Lake Balboa is a 27 acres (11 ha) lake filled with water reclaimed from the Tillman Water Reclamation Plant. It also has barbecue pits, children's play area, picnic tables, and covered picnic pavilions. There are many Flowering cherry trees (Prunus serrulata 'Pink Cloud') in the park.
Sepulveda Basin Wildlife Reserve
The Sepulveda Basin Wildlife Reserve is at the southeast end of the Sepulveda Flood Control Basin and Recreation Area. It has two sections, the North Reserve and South Reserve, located north and south of Burbank Boulevard. Both have nature paths and hiking trails. Access and parking are in eastern Woodley Park near to the Tillman Water Reclamation Plant, or from Burbank Boulevard east of Woodley Avenue.
Haskell Creek flows through the nature preserve, and there are several wildlife ponds. Over 200 species of birds have been seen in the basin. Many, attracted by the water, gather here during fall and spring migrations. The Sepulveda Basin Wildlife Reserve is an ongoing habitat restoration project, with locally native California plants. Native trees include Fremont's cottonwood (Populus fremontii), Coast live oak (Quercus agrifolia ), Valley oak, California Black Walnut (Juglans californica), and California sycamore (Platanus racemosa).
Sepulveda Dam Recreation Area Bike Path
The Sepulveda Dam Recreation Area Bike Path is a 9 miles (14 km) bicycle path route looping around the recreation area. It runs from Victory Boulevard near Interstate 405, westward to White Oak Avenue, south on White Oak to Burbank Boulevard, east on Burbank to Woodley Boulevard, and north on Woodley returning to Victory Boulevard. Public access is continuous along it.
A shorter route heads south on Balboa Boulevard, which crosses a natural stretch of the Los Angeles River that lined with native Arroyo willows, California sycamores, and other California native plants.
The loop sections along Victory and Burbank can be frequented by joggers. The bike path can seasonally have burr-bearing weeds, which may cause flats in less durable tires.
There is ample free parking available in the public park, sports field, &/or golf course lots on Burbank, Woodley and Balboa Boulevards.
Sepulveda Basin River Recreation Zone
The Sepulveda Basin River Recreation Zone extends from above Balboa Blvd to the confluence of Haskell Creek below Burbank Blvd. It is open for recreational non-motorized boating during the summer, with restricted access to some protected wildlife areas along the banks.
Other recreation facilities within the Sepulveda Dam Recreation Area include:
- Balboa Sports Complex, with a children's play area, community room, indoor gym; and lighted: baseball diamonds, basketball courts, soccer fields, football field, handball courts, tennis courts, and volleyball courts.
- Hjelte Sports Center, with softball diamonds.
- Sepulveda Garden Center, a community garden with 800 garden plots on 20 acres (8.1 ha), and public activity center building.
- Sherman Oaks Castle Park, with miniature golf, an arcade, and batting cages.
- Encino Golf Course, Balboa Golf Course, and Woodley Lakes Golf Course (all 18-hole).
- Apollo XI Field for model airplanes.
- "Sepulveda Dam Basin Master Plan and Environmental Assessment" (PDF). U.S. Army Corps of Engineers. Archived from the original (PDF) on 2014-03-08. Retrieved 2014-03-07.
- "The LA River and the Corps: A brief history". U.S. Army Corps of Engineers. Archived from the original on 2014-03-08. Retrieved 2014-03-08.
- "Sepulveda Basin Wildlife Reserve". City of Los Angeles Department of Recreation and Parks. Retrieved 2014-04-08.
- "History of the Los Anegeles River". Los Angeles Department of Public Works. 2014. Retrieved 2014-06-17.
- LAMountains.com: Sepulveda Basin Recreation Area
- City of Los Angeles Department of Recreation and Parks: Sepulveda Basin Recreation Area
- The Japanese Garden website . accessed 28 June 2016.
- City of Los Angeles Parks Department: Lake Balboa Park (Anthony C. Beilenson Park) Archived 2012-09-19 at the Wayback Machine
- Map of Lake Balboa Park
- Wikimedia galley: Cherry trees and blossoms at Lake Balboa Park
- SepulvedaBasinWildlife.org: Sepulveda Basin Wildlife Reserve website
- North Reserve, Sepulveda Basin Wildlife Reserve
- South Reserve, Sepulveda Basin Wildlife Reserve
- Sepulveda Basin Wildlife Reserve Trails Map
- Wildlife of the Sepulveda Basin Wildlife Reserve
- Flora of the Sepulveda Basin Wildlife Reserve
- L.A. Bike Paths.com: Sepulveda Dam Recreation Area Bike Path
- "Corps opens recreational boating program at Sepulveda". US Army Corps of Engineers. 2014-05-23. Archived from the original on 2014-05-24.
- City of Los Angeles Parks Department: Balboa Sports Complex Archived 2010-03-25 at the Wayback Machine
- Los Angeles Magazine: "Along Burbank Boulevard in Encino is a place called the Hjelte Sports Center. What’s a Hjelte, and how do you say it?", by Chris Nichols , 20 June 2011.
- City of Los Angeles Parks Department: Sepulveda Garden Center
- City of Los Angeles Parks Department: Sherman Oaks Castle Park
- Flying SoCal.com: Apollo XI Field at the Sepulveda Basin