Holbrook
Holbrook is an earth dam located in Lassen County, California, built in 1952. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Holbrook
Holbrook is a dam in Lassen, California. The dam is owned by Betty Carrol And Craig Rulison (private). It impounds the Ash Creek.
The dam stands 24 feet tall and stretches 455 feet across, creates a reservoir covering 122 acres, has a maximum storage capacity of 719 acre-feet, and collects water from a drainage area of 14 square miles. Completed in 1952, the structure is well into its service life at over 50 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/27/2025.
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Location
| State | California |
| County | Lassen |
| River/Stream | Ash Creek |
| Coordinates | 41.07780, -120.63140 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 455 ft |
| Year Completed | 1952 (74 years old) |
Storage & Hydraulics
| NID Storage | 719 acre-ft |
| Max Storage | 719 acre-ft |
| Surface Area | 122 acres |
| Drainage Area | 14 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Betty Carrol and Craig Rulison |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00945 |
| Federal ID | CA00945 |
| More Info | State Dam Safety Program |