Hannegan Road Detention Basin
Key Takeaway
Hannegan Road Detention Basin is classified as high hazard in Washington. It was completed in 1996 and is 30 years old. Its primary use is flood risk reduction. 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 Length | 180 ft |
| Dam Type | Earth |
| Max Storage | 98 acre-ft |
| Normal Storage | 49 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,370 cfs |
| Year Completed | 1996 (30 years old) |
| NID ID | WA00610 |
Safety Information
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?
Ownership
Bellingham City Public Works Dept
Local Government
Nearby Dams
St Clair Stormwater Detention Dam
Whatcom, WA
High HazardTelegraph Road Stormwater Detention Dam
Whatcom, WA
High HazardWhatcom Lake Dam
Whatcom, WA
High HazardHorton Road Detention Dam
Whatcom, WA
High HazardHappy Valley Stormwater Detention Basin
Whatcom, WA
High HazardBullard Dam
Whatcom, WA
High HazardGeneva Lake Dam
Whatcom, WA
High HazardPadden Lake Dam
Whatcom, WA
High HazardFrequently Asked Questions
What is the hazard classification of Hannegan Road Detention Basin?
Hannegan Road Detention Basin 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 Hannegan Road Detention Basin?
Hannegan Road Detention Basin is owned by Bellingham City Public Works Dept (Local Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Hannegan Road Detention Basin built?
Hannegan Road Detention Basin was completed in 1996, making it 30 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 Hannegan Road Detention Basin?
Hannegan Road Detention Basin serves the following purposes: Flood Risk Reduction. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
When was Hannegan Road Detention Basin last inspected?
Hannegan Road Detention Basin was last inspected on May 3, 2023. Inspection dates indicate when a formal review occurred, not the results of that inspection.