Upper Gila Valley Site No. 10 Dam
Upper Gila Valley Site No. 10 Dam is an earth dam located in Grant County, New Mexico, built in 1963. It carries a High hazard potential classification and has a poor condition assessment.
About Upper Gila Valley Site No. 10 Dam
The primary purpose of Upper Gila Valley Site No. 10 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Upper Gila Valley Arroyos Watershed District (local government). It impounds the Winn Canyon near Unincorporated Community Southeast Of Dam.
The dam stands 50 feet tall and stretches 650 feet across, has a maximum storage capacity of 982 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1963, 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 05/23/2018. That was 7 years ago, which is on the longer end for a high-hazard structure.
At 50 feet, this dam is taller than 93% of dams nationwide.
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 | Grant |
| Nearest City | Unincorporated Community Southeast Of Dam |
| River/Stream | Winn Canyon |
| Coordinates | 33.00953, -108.57437 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 47 ft |
| Dam Length | 650 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 982 acre-ft |
| Max Storage | 982 acre-ft |
| Drainage Area | 13 sq mi |
| Max Discharge | 7,140 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | UPPER GILA VALLEY ARROYOS WATERSHED DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 05/23/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NM00257 |
| Federal ID | NM00257 |
| More Info | State Dam Safety Program |