Mccoy Detention Dam is an earth dam located in Bernalillo County, New Mexico, built in 1991. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 47 ft47 ft tall and 2,738 ft long, taller than 91% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Mccoy Detention Dam
The primary purpose of Mccoy Detention 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 Albuquerque Metro Arroyo Flood Control Authority (local government). It impounds the Isleta Arroyo near Isleta.
The dam stands 47 feet tall and stretches 2,738 feet across, creates a reservoir covering 23 acres, has a maximum storage capacity of 365 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1991, the structure is 35 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 12/05/2018. That was 7 years ago, which is on the longer end for a high-hazard structure.
At 47 feet, this dam is taller than 91% 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 | Bernalillo |
| Nearest City | Isleta |
| River/Stream | Isleta Arroyo |
| Coordinates | 34.96107, -106.72084 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 35 ft |
| Dam Length | 2,738 ft |
| Year Completed | 1991 (35 years old) |
Storage & Hydraulics
| NID Storage | 365 acre-ft |
| Max Storage | 365 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 15,382 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Albuquerque Metro Arroyo Flood Control Authority |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/05/2018 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NM00539 |
| Federal ID | NM00539 |
| More Info | State Dam Safety Program |