Lake Cuyamaca
Lake Cuyamaca is an earth dam located in San Diego County, California, built in 1968. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lake Cuyamaca
The primary purpose of Lake Cuyamaca 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 Lake Cuyamaca Recreation And Park District (public utility). It impounds the Boulder Creek.
The dam stands 17 feet tall and stretches 1,027 feet across, creates a reservoir covering 110 acres, has a maximum storage capacity of 1,000 acre-feet, and collects water from a drainage area of 12 square miles. Completed in 1968, 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 12/23/2025.
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Location
| State | California |
| County | San Diego |
| River/Stream | Boulder Creek |
| Coordinates | 32.98750, -116.57690 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 1,027 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 1,000 acre-ft |
| Max Storage | 1,000 acre-ft |
| Surface Area | 110 acres |
| Drainage Area | 12 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lake Cuyamaca Recreation and Park District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/23/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00907 |
| Federal ID | CA00907 |
| More Info | State Dam Safety Program |