Lake Anna Dam And Reservoir
Lake Anna Dam And Reservoir is an earth dam located in Louisa County, Virginia, built in 1972. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Lake Anna Dam And Reservoir
The primary purpose of Lake Anna Dam And Reservoir is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. It impounds the North Anna near Hewlett.
The dam stands 100 feet tall and stretches 5,150 feet across, creates a reservoir covering 13,000 acres, has a maximum storage capacity of 487,000 acre-feet, and collects water from a drainage area of 343 square miles. 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. 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 04/19/2022.
At 100 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 Virginia 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 | Virginia |
| County | Louisa |
| Nearest City | Hewlett |
| River/Stream | North Anna |
| Coordinates | 38.01270, -77.71340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 100 ft |
| Dam Height | 90 ft |
| Dam Length | 5,150 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 487,000 acre-ft |
| Max Storage | 487,000 acre-ft |
| Normal Storage | 305,000 acre-ft |
| Surface Area | 13,000 acres |
| Drainage Area | 343 sq mi |
| Max Discharge | 142,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner Type | Not Listed |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/19/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | VA177002 |
| Federal ID | VA177002 |
| More Info | State Dam Safety Program |