Greeott is an earth dam located in Sonoma County, California, built in 1951. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 40 ft40 ft tall and 170 ft long, taller than 86% 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 Greeott
The primary purpose of Greeott 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 Frederick and Donna Furth (private). It impounds the Tr Windsor Creek.
The dam stands 40 feet tall and stretches 170 feet across, creates a reservoir covering 11 acres, has a maximum storage capacity of 100 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1951, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in 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 12/04/2025.
At 40 feet, this dam is taller than 86% of dams nationwide.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Tr Windsor Creek |
| Coordinates | 38.56310, -122.78090 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 170 ft |
| Year Completed | 1951 (75 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Surface Area | 11 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Frederick and Donna Furth |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/04/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01089 |
| Federal ID | CA01089 |
| More Info | State Dam Safety Program |