Quartz is an earth dam located in Tuolumne County, California, built in 1978. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 104 ft104 ft tall and 1,050 ft long, taller than 98% 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 Quartz
The primary purpose of Quartz 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 Tuolumne Utilities District (public utility). It impounds the Tr Woods Creek.
The dam stands 104 feet tall and stretches 1,050 feet across, creates a reservoir covering 47 acres, has a maximum storage capacity of 1,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1978, the structure is 48 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 09/16/2025.
At 104 feet, this dam is taller than 98% of all dams in the United States.
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Location
| State | California |
| County | Tuolumne |
| River/Stream | Tr Woods Creek |
| Coordinates | 37.92610, -120.43250 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 104 ft |
| Dam Height | 104 ft |
| Dam Length | 1,050 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 1,500 acre-ft |
| Max Storage | 1,500 acre-ft |
| Surface Area | 47 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Tuolumne Utilities District |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/16/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA01146 |
| Federal ID | CA01146 |
| More Info | State Dam Safety Program |