El Vado Dam impounds the

Rio Chama The Rio Chama, a major tributary river of the Rio Grande, is located in the U.S. states of Colorado and New Mexico. The river is about long altogether. From its source to El Vado Dam its length is about , from El Vado Dam to Abiquiu Dam is abo ...

in the U.S. state of

New Mexico New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...

, about north-northwest of New Mexico's largest city,

Albuquerque Albuquerque ( ; ), also known as ABQ, Burque, the Duke City, and in the past 'the Q', is the List of municipalities in New Mexico, most populous city in the U.S. state of New Mexico, and the county seat of Bernalillo County, New Mexico, Bernal ...

and about northwest of the capital city of Santa Fe. The earth-filled structure forms

El Vado Lake El Vado Lake is a reservoir located in Rio Arriba County, in northern New Mexico in the southwestern United States. Water is impounded by the earth-filled El Vado Dam, on the Rio Chama, long and high, completed in 1935. The lake is long ...

, a storage reservoir for the Middle Rio Grande Project, and has been designated as a New Mexico Historic Civil Engineering Landmark by the

American Society of Civil Engineers The American Society of Civil Engineers (ASCE) is a tax-exempt professional body founded in 1852 to represent members of the civil engineering profession worldwide. Headquartered in Reston, Virginia, it is the oldest national engineering soci ...

Construction

The El Vado dam was originally built by the

Middle Rio Grande Conservancy District The Middle Rio Grande Conservancy District (MRGCD) was formed in 1925 to manage the irrigation systems and control floods in the Albuquerque Basin. It is responsible for the stretch of river from the Cochiti Dam in Sandoval County, New Mexico, San ...

as a storage facility for irrigation water to be used in the

Middle Rio Grande Basin The Albuquerque Basin (or Middle Rio Grande Basin) is a structural basin and ecoregion within the Rio Grande rift in central New Mexico. It contains the city of Albuquerque, New Mexico, Albuquerque. Geologically, the Albuquerque Basin is a half- ...

. Construction began in 1933 and the dam was completed in 1935. Impoundment of the reservoir, which filled by 1936, inundated El Vado, the largest town of

Rio Arriba County Rio Arriba County () is a List of counties in New Mexico, county in the U.S. state of New Mexico. As of the 2020 United States census, 2020 census, the population was 40,363. Its county seat is Tierra Amarilla, New Mexico, Tierra Amarilla. Its ...

. The town's name meant "the crossing" in Spanish, and it was named so because it was an important ford and trading center on the Rio Chama during the 19th century. The dam was rehabilitated by the Bureau of Reclamation in 1954-1955. In the 1960s and 1970s, the

San Juan–Chama Project The San Juan–Chama Project is a U.S. Bureau of Reclamation interbasin water transfer project located in the states of New Mexico and Colorado in the United States. The project consists of a series of tunnels and diversions that take water from ...

built a diversion through a tunnel from the San Juan River basin to the Rio Chama, requiring an extensive retrofit of the dam's water conveyance facilities. The outlet works at El Vado Dam were enlarged between 1965 and 1966 so that releases from the Heron Dam could pass unimpeded through the dam. The capacity of the El Vado outlet works was increased to pass per second.

Structure

The El Vado dam is high and long, and holds of water. It has a concrete lined spillway capable of discharging of water. The dam also has a set of

outlet works A gatehouse, gate house, outlet works or valve house for a dam is a structure housing sluice gates, valves, or pumps (in which case it is more accurately called a pumping station). Many gatehouses are strictly utilitarian, but especially in the ni ...

, capable of carrying . Unlike most dams, El Vado Dam has a faceplate made of steel instead of concrete or rock. The dam has been leaking for decades as water has been seeping through the faceplate, undermining the dam's foundation.

Usage

Owned by the

United States Bureau of Reclamation The Bureau of Reclamation, formerly the United States Reclamation Service, is a federal agency under the U.S. Department of the Interior, which oversees water resource management, specifically as it applies to the oversight and operatio ...

, the El Vado dam serves for storage and flood-control purposes. It incorporates an 8 megawatt power generation facility owned by the Incorporated County of Los Alamos Department of Public Utilities. El Vado Lake, the reservoir formed by the dam, has and is surrounded by El Vado Lake State Park. The lake is a popular location for swimming, fishing and recreational boating.

Climate

References

{{Rio Grande dams and diversions Dams in New Mexico Buildings and structures in Rio Arriba County, New Mexico United States Bureau of Reclamation dams Dams completed in 1935 Dams in the Rio Grande basin 1935 establishments in New Mexico