The Leasburg Diversion Dam is a structure completed in 1907 on the Rio Grande in New Mexico, United States.

It diverts water from the Rio Grande into the 13.7 miles (22.0 km) long Leasburg Canal, which carries irrigation water into the upper Mesilla Valley, north of Las Cruces, New Mexico.

[1] The town of Leasburg, now Radium Springs, grew up around Fort Selden, 18 miles north of Las Cruces.

By 1908, the Rio Grande was being diverted into the Leasburg Canal to irrigate 31,600 acres (12,800 ha) of land in the upper Mesilla Valley.

Nine miles south of the dam, the 502 feet (153 m) long, steel truss Picacho Flume carried canal water over the Rio Grande.