Ayer Reservoir Dam is an earth dam located in San Juan County, Washington, built in 1964. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall, taller than 74% of U.S. dams with a recorded height. 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 Ayer Reservoir Dam
The primary purpose of Ayer Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Orcas Sound LLC (private). It impounds the Tr-east Sound.
The dam stands 32 feet tall, creates a reservoir covering 10 acres, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 08/03/2000. That was over 26 years ago.
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Location
| State | Washington |
| County | San Juan |
| River/Stream | Tr-east Sound |
| Coordinates | 48.63137, -122.89600 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 125 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 21 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Orcas Sound LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/03/2000 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00165 |
| Federal ID | WA00165 |
| More Info | State Dam Safety Program |