Silva Flat
Silva Flat is an earth dam located in Lassen County, California, built in 1926. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Silva Flat
The primary purpose of Silva Flat 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 Mr. Kenneth C. Gregory (private). It impounds the Juniper Creek.
The dam stands 11 feet tall and stretches 1,250 feet across, creates a reservoir covering 815 acres, has a maximum storage capacity of 3,900 acre-feet, and collects water from a drainage area of 15 square miles. Completed in 1926, the structure is well-established, with more than 75 years of service.
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 09/24/2025.
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Location
| State | California |
| County | Lassen |
| River/Stream | Juniper Creek |
| Coordinates | 40.96940, -120.92300 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 1,250 ft |
| Year Completed | 1926 (100 years old) |
Storage & Hydraulics
| NID Storage | 3,900 acre-ft |
| Max Storage | 3,900 acre-ft |
| Surface Area | 815 acres |
| Drainage Area | 15 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Mr. Kenneth C. Gregory |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/24/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00512 |
| Federal ID | CA00512 |
| More Info | State Dam Safety Program |