Airport Reservoir D
Airport Reservoir D is an earth dam located in Sonoma County, California, built in 2002. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Airport Reservoir D
The primary purpose of Airport Reservoir D is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Sonoma County Water Agency (local government). It impounds the Offstream.
The dam stands 45 feet tall and stretches 2,125 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 315 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2002, the structure is relatively new.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/14/2025.
At 45 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Offstream |
| Coordinates | 38.50500, -122.85260 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 45 ft |
| Dam Height | 45 ft |
| Dam Length | 2,125 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 315 acre-ft |
| Max Storage | 315 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Sonoma County Water Agency |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/14/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01445 |
| Federal ID | CA01445 |
| More Info | State Dam Safety Program |