San Acacia is a small unincorporated community and census-designated place in Socorro County, New Mexico, United States.

San Acacia gives its name to the stretch of the Rio Grande that extends south to the Elephant Butte Reservoir.

[5] The hill to the east of the San Acacio cemetery was the location where, in 1855, John W. Garretson fixed the Initial Point for the Principal Meridian and the Base Line.

[6] San Acacio became important in 1878 when the Atchison, Topeka and Santa Fe Railway was built through Socorro County on its route along the Rio Grande to El Paso, Texas.

The drawback was that the basalt that forms the walls of the gorge is a thin sheet resting on loose sand and gravel.

The report suggested that if eight Gradient Restoration Facilities were installed in the downstream reach, that should be enough to slow the water, allowing sediment to settle and making fish passage easier.

Again, it suggested emplacement of Gradient Restoration Facilities to control erosion as sediment above and below the dam returned to normal levels.