Piedmont
Piedmont is an earth dam located in Alameda County, California, built in 1905. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Piedmont
The primary purpose of Piedmont 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 East Bay Municipal Utility District (public utility). It impounds the Offstream.
The dam stands 64 feet tall and stretches 250 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 60 acre-feet. Completed in 1905, the structure is over a century 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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/23/2024.
At 64 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | California |
| County | Alameda |
| River/Stream | Offstream |
| Coordinates | 37.82820, -122.22340 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 64 ft |
| Dam Height | 64 ft |
| Dam Length | 250 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 60 acre-ft |
| Max Storage | 60 acre-ft |
| Surface Area | 3 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | East Bay Municipal Utility District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/23/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00170 |
| Federal ID | CA00170 |
| More Info | State Dam Safety Program |