Westchester Lagoon Dam
Westchester Lagoon Dam is an earth dam located in Municipality of Anchorage, Alaska, built in 1973. It carries a Significant hazard potential classification and has a fair condition assessment.
About Westchester Lagoon Dam
The primary purpose of Westchester Lagoon Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Anchorage Municipality Of (local government). It impounds the Chester Creek near Anchorage.
The dam stands 22 feet tall and stretches 1,830 feet across, creates a reservoir covering 60 acres, has a maximum storage capacity of 300 acre-feet, and collects water from a drainage area of 28 square miles. Completed in 1973, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 08/06/2018.
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Location
| State | Alaska |
| County | Municipality of Anchorage |
| Nearest City | Anchorage |
| River/Stream | Chester Creek |
| Coordinates | 61.20667, -149.92160 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 1,830 ft |
| Year Completed | 1973 (53 years old) |
Storage & Hydraulics
| NID Storage | 300 acre-ft |
| Max Storage | 300 acre-ft |
| Normal Storage | 200 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 28 sq mi |
| Max Discharge | 350 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | ANCHORAGE MUNICIPALITY OF |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/06/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AK00029 |
| Federal ID | AK00029 |
| More Info | State Dam Safety Program |