| Leasburg Diversion Dam | |
| Location Map: | New Mexico |
| Coordinates: | 32.4972°N -106.9227°W |
| Country: | United States |
| Location: | Doña Ana County, New Mexico |
| Purpose: | Irrigation |
| Opening: | 1907 |
| Owner: | United States Bureau of Reclamation |
| Dam Type: | Diversion dam |
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 long Leasburg Canal, which carries irrigation water into the upper Mesilla Valley, north of Las Cruces, New Mexico.
The town of Leasburg, now Radium Springs, grew up around Fort Selden, 18 miles north of Las Cruces. A diversion dam was built for irrigation purposes built of poles and interwoven with twigs and stones for ballast. The Rio Grande Project was authorized on 2 December 1905.The U.S. Reclamation Service designed a high, long concrete weir to replace the old dam. Work began in November 1906.
Leasburg Diversion Dam was the first dam completed on the Rio Grande Project by the United States Bureau of Reclamation. By 1908, the Rio Grande was being diverted into the Leasburg Canal to irrigate of land in the upper Mesilla Valley. Nine miles south of the dam, the long, steel truss Picacho Flume carried canal water over the Rio Grande. In 1919 the crest of Leasburg Dam was raised .
Recreation opportunities at the dam are operated by Leasburg Dam State Park.
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