Early Vision Pre-1900

Throughout the nineteenth century, communities along the Rio Grande pressed for a storage reservoir to moderate the river's extremes.

Authorization and Planning 1904 - 1910

The U.S. Reclamation Service formally authorized the Rio Grande Project in 1904, selecting a basalt canyon near Engle, New Mexico, as the future dam site.

Construction Period 1911 - 1916

Work commenced in 1911 with diversion tunnels, worker camps, and a cableway suspended across the canyon. Engineers poured massive concrete foundations and installed hoists powered by small hydro generators.

By 1914 the dam was taking shape. Storage began late in 1915 even as crews finished ancillary structures. On October 19, 1916, dignitaries and residents gathered for the dedication ceremony.

Early Operation and Expansion 1917 - 1930s

With the dam complete, an extensive network of canals carried water to farms across the Rio Grande Valley. By 1938 the project added a hydroelectric plant below the dam.

Mid-Century Events 1940s - 1970s

Postwar decades filled Elephant Butte Reservoir to the brim, and the lake became a regional recreation destination. In 1979 the dam entered the National Register of Historic Places.

Modern Era 1980s - Present

Exceptional inflows in the mid-1980s sent water across the spillway for nearly three consecutive years—the longest sustained release on record. In the 2000s and 2010s, prolonged drought and upstream demand exposed once-submerged features, including a 3.2-million-year-old stegomastodon skull unearthed in 2014.