Moskowite
Moskowite is an earth dam located in Napa County, California, built in 1955. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Moskowite
The primary purpose of Moskowite 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 George Moskowite (private). It impounds the Tr Capell Creek.
The dam stands 50 feet tall and stretches 900 feet across, creates a reservoir covering 29 acres, has a maximum storage capacity of 472 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1955, 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 09/23/2025.
At 50 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | California |
| County | Napa |
| River/Stream | Tr Capell Creek |
| Coordinates | 38.45730, -122.19370 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 50 ft |
| Dam Height | 50 ft |
| Dam Length | 900 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 472 acre-ft |
| Max Storage | 472 acre-ft |
| Surface Area | 29 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | George Moskowite |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/23/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00583 |
| Federal ID | CA00583 |
| More Info | State Dam Safety Program |