30 Mg Central Reservoir
30 Mg Central Reservoir is an earth dam located in Orange County, California, built in 1924. It carries a High hazard potential classification and has a satisfactory condition assessment.
About 30 Mg Central Reservoir
The primary purpose of 30 Mg Central Reservoir 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 City Of Brea (local government). It impounds the Offstream near La Habra.
The dam stands 30 feet tall and stretches 1,596 feet across, creates a reservoir covering 5 acres, and has a maximum storage capacity of 92 acre-feet. Completed in 1924, the structure is over a century 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 04/17/2025.
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 | Orange |
| Nearest City | La Habra |
| River/Stream | Offstream |
| Coordinates | 33.92600, -117.90910 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,596 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 92 acre-ft |
| Max Storage | 92 acre-ft |
| Surface Area | 5 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Brea |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/17/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01113 |
| Federal ID | CA01113 |
| More Info | State Dam Safety Program |