Hillside Ranch
Hillside Ranch is an earth dam located in Sonoma County, California, built in 1967. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Hillside Ranch
The primary purpose of Hillside Ranch 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 Rafanelli And Nahas Real Estate Development (private). It impounds the Tr House Creek.
The dam stands 60 feet tall and stretches 317 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 210 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1967, 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 04/21/2025.
At 60 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Tr House Creek |
| Coordinates | 38.65650, -123.18230 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 60 ft |
| Dam Height | 60 ft |
| Dam Length | 317 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 210 acre-ft |
| Max Storage | 210 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Rafanelli and Nahas Real Estate Development |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/21/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01067 |
| Federal ID | CA01067 |
| More Info | State Dam Safety Program |