Sack
Sack is a buttress dam located in Madera County, California, built in 1946. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Sack
Sack is a dam in Madera, California. The dam is owned by Henry Miller Reclamation District (public utility). It impounds the San Joaquin River.
The dam stands 9 feet tall and stretches 100 feet across, creates a reservoir covering 36 acres, and has a maximum storage capacity of 165 acre-feet. Completed in 1946, the structure is well-established, with more than 75 years of service.
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 03/27/2025.
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Location
| State | California |
| County | Madera |
| River/Stream | San Joaquin River |
| Coordinates | 36.98370, -120.50000 |
Physical Characteristics
| Dam Type | Buttress |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 100 ft |
| Year Completed | 1946 (80 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Surface Area | 36 acres |
Ownership & Safety
| Purpose | Other |
| Owner | Henry Miller Reclamation District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/27/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA10411 |
| Federal ID | CA10411 |
| More Info | State Dam Safety Program |