Littlerock
Littlerock is a roller-compacted concrete dam located in Los Angeles County, California, built in 1924. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Littlerock
Littlerock is a dam in Los Angeles, California. The dam is owned by Littlerock Creek Irrigation District (public utility). It impounds the Littlerock Cr near Palmdale.
The dam stands 124 feet tall and stretches 576 feet across, creates a reservoir covering 126 acres, has a maximum storage capacity of 4,600 acre-feet, and collects water from a drainage area of 63 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 05/01/2025.
At 124 feet, this dam is taller than 98% 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 | Palmdale |
| River/Stream | Littlerock Cr |
| Coordinates | 34.48530, -118.02150 |
Physical Characteristics
| Dam Type | Roller-Compacted Concrete |
| NID Height | 124 ft |
| Dam Height | 124 ft |
| Dam Length | 576 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 4,600 acre-ft |
| Max Storage | 4,600 acre-ft |
| Surface Area | 126 acres |
| Drainage Area | 63 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Littlerock Creek Irrigation District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/01/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00237 |
| Federal ID | CA00237 |
| More Info | State Dam Safety Program |