R. Simoni Irrigation is an earth dam located in Santa Clara County, California, built in 1961. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 44 ft44 ft tall and 330 ft long, taller than 89% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About R. Simoni Irrigation
The primary purpose of R. Simoni Irrigation 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 Della Erta Simoni (private). It impounds the Hay Canyon.
The dam stands 44 feet tall and stretches 330 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 152 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1961, 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 04/14/2025.
At 44 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | California |
| County | Santa Clara |
| River/Stream | Hay Canyon |
| Coordinates | 37.08720, -121.70660 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 44 ft |
| Dam Height | 44 ft |
| Dam Length | 330 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 152 acre-ft |
| Max Storage | 152 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 1 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Della Erta Simoni |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/14/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01015 |
| Federal ID | CA01015 |
| More Info | State Dam Safety Program |