Ponderosa Lake Dam
Ponderosa Lake Dam is an earth dam located in Stevens County, Washington, built in 1969. It carries a High hazard potential classification and has a poor condition assessment.
About Ponderosa Lake Dam
The primary purpose of Ponderosa Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Pearl Street Apartments Llc (private). It impounds the Beaver Creek near Milan.
The dam stands 60 feet tall and stretches 500 feet across, creates a reservoir covering 75 acres, has a maximum storage capacity of 1,400 acre-feet, and collects water from a drainage area of 7 square miles. Completed in 1969, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 08/05/2021.
At 60 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 Washington 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 | Washington |
| County | Stevens |
| Nearest City | Milan |
| River/Stream | Beaver Creek |
| Coordinates | 48.10103, -117.44800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 60 ft |
| Dam Length | 500 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 1,400 acre-ft |
| Max Storage | 1,400 acre-ft |
| Normal Storage | 710 acre-ft |
| Surface Area | 75 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 500 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Pearl Street Apartments LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Poor |
| Last Inspection | 08/05/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00041 |
| Federal ID | WA00041 |
| More Info | State Dam Safety Program |