Green Valley Lake
Green Valley Lake is a multi-arch dam located in San Bernardino County, California, built in 1925. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Green Valley Lake
The primary purpose of Green Valley Lake 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 Green Valley Mutual Water Company (private). It impounds the Green Valley Cr.
The dam stands 56 feet tall and stretches 425 feet across, creates a reservoir covering 22 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1925, the structure is over a century 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 05/21/2025.
At 56 feet, this dam is taller than 94% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | San Bernardino |
| River/Stream | Green Valley Cr |
| Coordinates | 34.23890, -117.08230 |
Physical Characteristics
| Dam Type | Multi-Arch |
| NID Height | 56 ft |
| Dam Height | 56 ft |
| Dam Length | 425 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Surface Area | 22 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Green Valley Mutual Water Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/21/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00758 |
| Federal ID | CA00758 |
| More Info | State Dam Safety Program |