Adjuntas Dam
Adjuntas Dam is a gravity dam located in Adjuntas County, Puerto Rico, built in 1950. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Adjuntas Dam
The primary purpose of Adjuntas Dam is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Puerto Rico Electric Power Authority (public utility). It impounds the Grande De Arecibo River near Utuado.
The dam stands 80 feet tall, creates a reservoir covering 15 acres, has a maximum storage capacity of 760 acre-feet, and collects water from a drainage area of 14 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/08/2019.
At 80 feet, this dam is taller than 97% 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 Puerto Rico 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 | Puerto Rico |
| County | Adjuntas |
| Nearest City | Utuado |
| River/Stream | Grande De Arecibo River |
| Coordinates | 18.19963, -66.73220 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 80 ft |
| Dam Height | 80 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 760 acre-ft |
| Max Storage | 760 acre-ft |
| Normal Storage | 384 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 14 sq mi |
| Max Discharge | 37,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PUERTO RICO ELECTRIC POWER AUTHORITY |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/08/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PR00007 |
| Federal ID | PR00007 |
| More Info | State Dam Safety Program |