Red Rock No. 1
Red Rock No. 1 is an earth dam located in Lassen County, California, built in 1893. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Red Rock No. 1
The primary purpose of Red Rock No. 1 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 Dodge Ranch Llc (private). It impounds the Red Rock Creek.
The dam stands 63 feet tall and stretches 485 feet across, creates a reservoir covering 491 acres, has a maximum storage capacity of 10,000 acre-feet, and collects water from a drainage area of 43 square miles. Completed in 1893, 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 08/26/2025.
At 63 feet, this dam is taller than 96% 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 | Lassen |
| River/Stream | Red Rock Creek |
| Coordinates | 40.96780, -120.13800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 63 ft |
| Dam Height | 63 ft |
| Dam Length | 485 ft |
| Year Completed | 1893 (133 years old) |
Storage & Hydraulics
| NID Storage | 10,000 acre-ft |
| Max Storage | 10,000 acre-ft |
| Surface Area | 491 acres |
| Drainage Area | 43 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Dodge Ranch LLC |
| Owner Type | Private |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/26/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00510 |
| Federal ID | CA00510 |
| More Info | State Dam Safety Program |