El Casco
El Casco is an earth dam located in Riverside County, California, built in 1879. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About El Casco
The primary purpose of El Casco 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 Two Canyons Conservancy (private). It impounds the San Timoteo Creek.
The dam stands 19 feet tall and stretches 1,200 feet across, creates a reservoir covering 15 acres, and has a maximum storage capacity of 143 acre-feet. Completed in 1879, 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 02/26/2025.
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Location
| State | California |
| County | Riverside |
| River/Stream | San Timoteo Creek |
| Coordinates | 33.97700, -117.10890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1879 (147 years old) |
Storage & Hydraulics
| NID Storage | 143 acre-ft |
| Max Storage | 143 acre-ft |
| Surface Area | 15 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Two Canyons Conservancy |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/26/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00767 |
| Federal ID | CA00767 |
| More Info | State Dam Safety Program |