Impoundment C-66 is an earth dam located in Freestone County, Texas, built in 1989. It carries a Low hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 6,000 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Impoundment C-66
The primary purpose of Impoundment C-66 is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by Luminant Power Company LLC (private). It impounds the Tehuacana near Fairfield.
The dam stands 24 feet tall and stretches 6,000 feet across, creates a reservoir covering 114 acres, has a maximum storage capacity of 1,945 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1989, the structure is 37 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. The most recent inspection on record was 11/03/2017.
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Location
| State | Texas |
| County | Freestone |
| Nearest City | Fairfield |
| River/Stream | Tehuacana |
| Coordinates | 31.86361, -96.05036 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 6,000 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 1,945 acre-ft |
| Max Storage | 1,945 acre-ft |
| Normal Storage | 464 acre-ft |
| Surface Area | 114 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 2,405 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | Luminant Power Company LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/03/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX07304 |
| Federal ID | TX07304 |
| More Info | State Dam Safety Program |