Willetto Dam
Willetto Dam is an earth dam located in San Juan County, New Mexico, built in 1972. It carries a High hazard potential classification.
About Willetto Dam
Willetto Dam is a dam in San Juan, New Mexico. The dam is owned by Bureau Of Reclamation (federal). It impounds the San Juan River - Os near Waterflow.
The dam stands 98 feet tall and stretches 1,760 feet across, and has a maximum storage capacity of 3,285 acre-feet. Completed in 1972, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. The most recent inspection on record was 11/05/2019.
At 98 feet, this dam is taller than 98% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New Mexico dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | New Mexico |
| County | San Juan |
| Nearest City | Waterflow |
| River/Stream | San Juan River - Os |
| Coordinates | 36.78602, -108.44482 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 98 ft |
| Dam Length | 1,760 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 3,285 acre-ft |
| Max Storage | 3,285 acre-ft |
| Max Discharge | 730 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 11/05/2019 |
Identifiers
| NID ID | NM00346 |
| Federal ID | NM00346 |
| More Info | State Dam Safety Program |