Wood Ranch
Wood Ranch is an earth dam located in Ventura County, California, built in 1965. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Wood Ranch
The primary purpose of Wood Ranch 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 Calleguas Municipal Water District (public utility). It impounds the Offstream near Simi Valley.
The dam stands 146 feet tall and stretches 1,020 feet across, creates a reservoir covering 230 acres, has a maximum storage capacity of 11,000 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 12/02/2024.
At 146 feet, this dam is taller than 99% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | Ventura |
| Nearest City | Simi Valley |
| River/Stream | Offstream |
| Coordinates | 34.23700, -118.81710 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 146 ft |
| Dam Height | 146 ft |
| Dam Length | 1,020 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 11,000 acre-ft |
| Max Storage | 11,000 acre-ft |
| Surface Area | 230 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Calleguas Municipal Water District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/02/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00850 |
| Federal ID | CA00850 |
| More Info | State Dam Safety Program |