From The Rio Grande Sun (Molly Montgomery):
Beginning in 2021, the Bureau of Reclamation will repair El Vado Dam.
Built in 1935, the dam is one of the only steel faceplated dams in the country. It can store around 200,000 acre-feet of water.
Some of the steel faceplates of the dam have become cracked and bent due to shifts in the land around the dam, wrote Bureau of Reclamation Public Affairs Specialist Mary Carlson in a March 6 email.
The shifts in land have also caused erosion behind the faceplates and cracks and bending in the plates on the dam’s spillway, she wrote.
Bureau of Reclamation Civil Engineer Carolyn Donnelly discussed the potential effects of these changes at the Fifth Annual Rio Chama Congreso Feb. 29.
“The spillway, some of those face plates, if you walk on it, you can hear it’s kind of hollow underneath and they move, so if we started using that at the full capacity, water could get under those plates, take them out, and then there could be failure of the dam,” Donnelly said. “And luckily there’s not a large population downstream, but for those who are there it would not be a good thing.”
El Vado stores water for irrigation in the Middle Rio Grande Conservancy District, which includes six pueblos—Santa Ana, Kewa, Cochiti, San Felipe, Isleta and Sandia.
It also sometimes stores drinking water for cities including Santa Fe and Albuquerque as part of the San Juan-Chama Project.
Carlson wrote that the Bureau of Reclamation is still working out details about how water will be stored and move during the repair, for which the reservoir will be close to empty for at least a year.