Diamond Lake Aeration Lagoon No 2 is an earth dam located in Pend Oreille County, Washington, built in 1987. It carries a High hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 800 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Diamond Lake Aeration Lagoon No 2
Diamond Lake Aeration Lagoon No 2 is a dam in Pend Oreille, Washington. The dam is owned by Diamond Lake Sewer Dist (public utility). It impounds the Tr-little Spokane River-offstr.
The dam stands 16 feet tall and stretches 800 feet across, creates a reservoir covering 51 acres, has a maximum storage capacity of 62 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1987, the structure is 39 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 08/25/2021.
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 | Pend Oreille |
| River/Stream | Tr-little Spokane River-offstr |
| Coordinates | 48.12809, -117.16459 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Length | 800 ft |
| Year Completed | 1987 (39 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Surface Area | 51 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 20 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Diamond Lake Sewer Dist |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/25/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00568 |
| Federal ID | WA00568 |
| More Info | State Dam Safety Program |