Cidra Dam
Cidra Dam is a gravity dam located in Cidra County, Puerto Rico, built in 1946. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Cidra Dam
The primary purpose of Cidra Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Puerto Rico Aqueduct And Sewer Authority (public utility). It impounds the Bayamon River near Cidra.
The dam stands 115 feet tall and stretches 541 feet across, creates a reservoir covering 268 acres, has a maximum storage capacity of 10,800 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1946, 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 03/17/2022.
At 115 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 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 | Cidra |
| Nearest City | Cidra |
| River/Stream | Bayamon River |
| Coordinates | 18.19711, -66.14059 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 115 ft |
| Dam Height | 115 ft |
| Dam Length | 541 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 10,800 acre-ft |
| Max Storage | 10,800 acre-ft |
| Normal Storage | 5,300 acre-ft |
| Surface Area | 268 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 13,500 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | PUERTO RICO AQUEDUCT AND SEWER AUTHORITY |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/17/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | PR00020 |
| Federal ID | PR00020 |
| More Info | State Dam Safety Program |