Lafranchi Creek
Lafranchi Creek is an earth dam located in Sonoma County, California, built in 1982. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lafranchi Creek
The primary purpose of Lafranchi Creek 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 Wine World, Inc. (private). It impounds the Lafranchi Creek.
The dam stands 23 feet tall and stretches 965 feet across, creates a reservoir covering 30 acres, and has a maximum storage capacity of 100 acre-feet. Completed in 1982, the structure is 44 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 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 08/14/2025.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Lafranchi Creek |
| Coordinates | 38.64880, -122.70070 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 965 ft |
| Year Completed | 1982 (44 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Surface Area | 30 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Wine World, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/14/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01318 |
| Federal ID | CA01318 |
| More Info | State Dam Safety Program |