Reservoir A Dam
Reservoir A Dam is an earth dam located in Nez Perce County, Idaho, built in 1907. It carries a High hazard potential classification.
About Reservoir A Dam
The primary purpose of Reservoir A Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau Of Reclamation (federal). It impounds the Lindsay Creek near Lewiston.
The dam stands 61 feet tall and stretches 2,200 feet across, creates a reservoir covering 155 acres, has a maximum storage capacity of 3,665 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1907, the structure is over a century 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/06/2023.
At 61 feet, this dam is taller than 95% 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 Idaho 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 | Idaho |
| County | Nez Perce |
| Nearest City | Lewiston |
| River/Stream | Lindsay Creek |
| Coordinates | 46.37160, -116.85790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 61 ft |
| Dam Height | 61 ft |
| Dam Length | 2,200 ft |
| Year Completed | 1907 (119 years old) |
Storage & Hydraulics
| NID Storage | 3,665 acre-ft |
| Max Storage | 3,665 acre-ft |
| Normal Storage | 3,300 acre-ft |
| Surface Area | 155 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 130 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | High |
| Condition Assessment | Not Available |
| Last Inspection | 09/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ID00261 |
| Federal ID | ID00261 |
| More Info | State Dam Safety Program |