Ayer Reservoir Dam
Key Takeaway
Ayer Reservoir Dam is classified as low hazard in Washington. It was completed in 1964 and is 62 years old. Its primary use is recreation.
Physical Details
| Dam Type | Earth |
| Max Storage | 135 acre-ft |
| Normal Storage | 125 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 21 cfs |
| Year Completed | 1964 (62 years old) |
| NID ID | WA00165 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
Orcas Sound LLC
Private
Nearby Dams
Martins Lake Dam
San Juan, WA
Low HazardCascade Lake Dam
San Juan, WA
High HazardFowler Reservoir Dam
San Juan, WA
Low HazardBuck Mountain Reservoir Dam No 1
San Juan, WA
High HazardBuck Mountain Reservoir Dam No 2
San Juan, WA
High HazardBuck Mountain Reservoir Dam No 3
San Juan, WA
High HazardBoyd Lower Reservoir Dam
San Juan, WA
High HazardMountain Lake Dam
San Juan, WA
High HazardFrequently Asked Questions
What is the hazard classification of Ayer Reservoir Dam?
Ayer Reservoir Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Ayer Reservoir Dam?
Ayer Reservoir Dam is owned by Orcas Sound LLC (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Ayer Reservoir Dam built?
Ayer Reservoir Dam was completed in 1964, making it 62 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 Ayer Reservoir Dam?
Ayer Reservoir Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Ayer Reservoir Dam last inspected?
Ayer Reservoir Dam was last inspected on February 7, 2020. Inspection dates indicate when a formal review occurred, not the results of that inspection.