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    The Mojave Forks Dam, most often known as the Mojave River Dam, is an earth-fill dry dam across the Mojave River in San Bernardino County, California in the United States. Completed in 1974 by the U.S. Army Corps of Engineers (USACE), the dam is located at the confluence of the West Fork Mojave River and Deep Creek, and can store approximately 179,400 acre⋅ft (221,300,000 m3) of water.


    History


    The Mojave River forks were first identified as a potential dam site in 1875, and flooding in the 1930s confirmed the need for a flood control facility along the Mojave River. However, it would be 30 more years before the state endorsed such a project. The West Fork Flood Control and Reservoir Project were authorized in 1960, and the USACE created a final design by 1966. Construction began in June 1967, and the embankment was topped out in May 1971. The project was formally completed and operational by 1974.
    Federal engineers found in 2019 that the dam falls short of national safety standards and could erode and collapse in an extreme flood.


    Dimensions and location


    The dam is 200 feet (61 m) high from the foundations, 193 feet (59 m) high above the riverbed, and 2,223 feet (678 m) long. The main embankment, a rolled earthfill design, contains 5,310,000 cubic yards (4,060,000 m3) of material. A smaller auxiliary dam is located directly to the west of the main dam, while the concrete spillway is on the east side of the dam.
    The reservoir controls runoff from a rugged drainage basin of 215 square miles (560 km2) on the north slope of the San Bernardino Mountains. Although the entire Mojave River basin covers 4,700 square miles (12,000 km2), the comparatively small area behind the dam contributes the vast majority of the water in the river, the remaining 95 percent of the watershed being desert. The towns of Victorville, Hesperia and others in the Victor Valley region along the Mojave River, as well as towns further downstream such as Barstow, are the primary beneficiaries of the project.


    Operations


    Because the dam serves strictly for flood control, the reservoir is usually low or non-existent; however, it can fill quickly following heavy winter storms. Flood waters are released as quickly as possible without exceeding the capacity of downstream levees. Unlike most dams, the Mojave Dam outlet has no gates, meaning that the outflow is directly dependent on the water level behind the dam. All river flows below 7,300 cubic feet per second (210 m3/s) pass unimpeded through the dam's outlets. The dam is designed to contain a design flood of 94,000 cubic feet per second (2,700 m3/s), to a maximum outflow of 23,500 cubic feet per second (670 m3/s). The reservoir is generally drained within 2–3 days of a flooding event.
    Because the dam reduces the sharp peaks of flash floods in the Mojave River channel, it also provides incidental groundwater recharge benefits in the Victor Valley area.


    Recreation


    Although there is no permanent pool at Mojave Forks, the dam and the surrounding area are part of Mojave River Forks Regional Park, which provides camping and hiking facilities. The Pacific Crest Trail also runs parallel the eastern end of the dam as it travels between the valleys of Deep Creek and the West Fork Mojave River.


    See also


    Cedar Springs Dam/Silverwood Lake
    Los Angeles Flood of 1938
    Mojave Narrows Park


    References

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Mojave River Dam - United States Army

Built in 1971, the Mojave River Dam was designed and constructed consistent with the standards of the day. It continues to operate as it was designed and reduces risk for more than 16,000...

Mojave River Forks Regional Park – Parks

Adventures near Mojave River Forks include the Pacific Crest Trail and Deep Creek Hot Springs. This park provides serenity for those who enjoy nature and wide open space and is open year …

Mojave Forks Dam - Wikiwand

The Mojave Forks Dam, most often known as the Mojave River Dam, is an earth-fill dry dam across the Mojave River in San Bernardino County, California in the United States. Completed …

Mojave River Dam - Outdoorsy

The Mojave River Dam is a U.S Corps of Engineers Dam situated a few miles south from the City of Hesperia, California. The dam on the Mojave River provides flood control to the region in …

Army Corps reclassifies Mojave River Dam risk …

Nov 1, 2019 · The U.S. Army Corps of Engineers has changed Mojave River Dam’s risk characterization from low to high urgency of action. The change was the result of recent risk assessment findings that...

Mojave Forks River Dam Overlook Trail - AllTrails

Get to know this 3.2-mile out-and-back trail near Hesperia, California. Generally considered a moderately challenging route, it takes an average of 1 h 29 min to complete. This trail is great for hiking, mountain biking, and running, and it's …

Climate change could cause Mojave River Dam to fail, …

Nov 6, 2019 · Failure of the 200-foot-tall earthen dam on the northern flanks of the San Bernardino Mountains would send water rushing down the river channel, inundating 16,000 people and $1.5 billion in...

Mojave Forks Dam facts for kids - Kids encyclopedia

The Mojave Forks Dam, most often known as the Mojave River Dam, is an earth-fill dry dam across the Mojave River in San Bernardino County, California in the United States. Completed in 1974 by the U.S. Army Corps of Engineers …

Mojave Forks River Dam Overlook Trail - The Outbound

Mojave Forks River Dam Overlook Trail is an out-and-back trail that takes you by a river located near Hesperia, California.