Nookachamps Hills Dam
Nookachamps Hills Dam is an earth dam located in Skagit County, Washington, built in 1969. It carries a Significant hazard potential classification and has a poor condition assessment.
About Nookachamps Hills Dam
The primary purpose of Nookachamps Hills Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Nookachamp Hills Hoa (private). It impounds the Tr-nookachamps Creek near Mount Vernon.
The dam stands 54 feet tall and stretches 850 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 144 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1969, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 08/02/2018.
At 54 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Washington |
| County | Skagit |
| Nearest City | Mount Vernon |
| River/Stream | Tr-nookachamps Creek |
| Coordinates | 48.40091, -122.22790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 54 ft |
| Dam Length | 850 ft |
| Year Completed | 1969 (57 years old) |
Storage & Hydraulics
| NID Storage | 144 acre-ft |
| Max Storage | 144 acre-ft |
| Normal Storage | 118 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 169 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Nookachamp Hills HOA |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/02/2018 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00141 |
| Federal ID | WA00141 |
| More Info | State Dam Safety Program |