Bosch No. 2 is an earth dam located in Sonoma County, California, built in 1962. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 55 ft55 ft tall and 230 ft long, taller than 94% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Bosch No. 2
The primary purpose of Bosch No. 2 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 Dorado Toyfoya (private). It impounds the Tr Windsor Creek.
The dam stands 55 feet tall and stretches 230 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 37 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1962, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/15/2025.
At 55 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | California |
| County | Sonoma |
| River/Stream | Tr Windsor Creek |
| Coordinates | 38.55860, -122.74800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 230 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 37 acre-ft |
| Max Storage | 37 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Dorado Toyfoya |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/15/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01044 |
| Federal ID | CA01044 |
| More Info | State Dam Safety Program |