Tmpa Gibbons Creek Mine Dam Sp-20 is an earth dam located in Grimes County, Texas, built in 1992. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 7,300 ft long, taller than 62% of U.S. dams with a recorded height. 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 Tmpa Gibbons Creek Mine Dam Sp-20
The primary purpose of Tmpa Gibbons Creek Mine Dam Sp-20 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 Texas Municipal Power Agency (local government). It impounds the Tr-gibbons Creek.
The dam stands 28 feet tall and stretches 7,300 feet across, creates a reservoir covering 48 acres, has a maximum storage capacity of 905 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1992, the structure is 34 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 12/16/2010. That was over 15 years ago.
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Location
| State | Texas |
| County | Grimes |
| River/Stream | Tr-gibbons Creek |
| Coordinates | 30.56093, -96.08245 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 7,300 ft |
| Year Completed | 1992 (34 years old) |
Storage & Hydraulics
| NID Storage | 905 acre-ft |
| Max Storage | 905 acre-ft |
| Normal Storage | 169 acre-ft |
| Surface Area | 48 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 2,938 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | Texas Municipal Power Agency |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/16/2010 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX06563 |
| Federal ID | TX06563 |
| More Info | State Dam Safety Program |