Stone Canyon
Stone Canyon is an earth dam located in Los Angeles County, California, built in 1924. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Stone Canyon
The primary purpose of Stone Canyon 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 Los Angeles Department Of Water And Power (local government). It impounds the Stone Canyon Cr near Santa Moncia.
The dam stands 188 feet tall and stretches 1,150 feet across, creates a reservoir covering 138 acres, has a maximum storage capacity of 10,372 acre-feet, and collects water from a drainage area of 1 square miles. 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 11/04/2025.
At 188 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 | Los Angeles |
| Nearest City | Santa Moncia |
| River/Stream | Stone Canyon Cr |
| Coordinates | 34.10670, -118.45510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 188 ft |
| Dam Height | 188 ft |
| Dam Length | 1,150 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 10,372 acre-ft |
| Max Storage | 10,372 acre-ft |
| Surface Area | 138 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Los Angeles Department of Water and Power |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/04/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00083 |
| Federal ID | CA00083 |
| More Info | State Dam Safety Program |