Diamond Lake Aeration Lagoon No 3

Tr-Little Spokane River-Offstr· Pend Oreille, Washington· Built 1987· Earth·
High Hazard Other Public Utility

Key Takeaway

Diamond Lake Aeration Lagoon No 3 is classified as high hazard in Washington. It was completed in 1987 and is 39 years old. Its primary use is other. High hazard means loss of life is likely if the dam fails — it does not indicate the dam's current condition. Learn more.

Physical Details

Dam Length1,570 ft
Dam TypeEarth
Max Storage61 acre-ft
Normal Storage0 acre-ft
Surface Area51 acres
Drainage Area0 sq mi
Max Discharge20 cfs
Year Completed1987 (39 years old)
NID IDWA00567

Safety Information

High Hazard

Loss of human life is likely if the dam fails.

Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?

Emergency Action Plan: Yes
Last Inspection: November 14, 2023
State Regulated: Yes
Regulatory Agency: Washington Dept of Ecology

Ownership

Diamond Lake Sewer Dist

Public Utility

Nearby Dams

Frequently Asked Questions

What is the hazard classification of Diamond Lake Aeration Lagoon No 3?

Diamond Lake Aeration Lagoon No 3 is classified as High Hazard. Loss of human life is likely if the dam fails. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.

Who owns and operates Diamond Lake Aeration Lagoon No 3?

Diamond Lake Aeration Lagoon No 3 is owned by Diamond Lake Sewer Dist (Public Utility). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.

When was Diamond Lake Aeration Lagoon No 3 built?

Diamond Lake Aeration Lagoon No 3 was completed in 1987, making it 39 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.

What is the primary purpose of Diamond Lake Aeration Lagoon No 3?

Diamond Lake Aeration Lagoon No 3 serves the following purposes: Other. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.

When was Diamond Lake Aeration Lagoon No 3 last inspected?

Diamond Lake Aeration Lagoon No 3 was last inspected on November 14, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.

Data from the National Inventory of Dams (NID) maintained by the US Army Corps of Engineers. Dam conditions may have changed since the last update. This site is not affiliated with USACE. Do not use for emergency planning — contact your local dam safety program.