Tmpa Gibbons Creek Mine Dam Sp-20 Reservoir Report
Last Updated: December 5, 2025
Tmpa Gibbons Creek Mine Dam Sp-20, located in Grimes, Texas, is a crucial water resource infrastructure managed by the local government.
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Summary
Built in 1992 by Morrison Knudsen, this Earth dam stands at a height of 28 feet with a length of 7300 feet, serving primarily for tailings storage. With a storage capacity of 906 acre-feet, the dam overlooks the TR-Gibbons Creek and is regulated by the Texas Commission on Environmental Quality (TCEQ).
Despite being classified as having a moderate risk level, the dam has not been rated for its condition assessment. It features an uncontrolled spillway with a width of 104 feet and is equipped with two uncontrolled outlet gates. The dam's purpose, design, and construction indicate a significant role in water resource management and flood control in the region. While the last inspection dates back to 2010, the dam's inspection frequency and emergency preparedness measures remain undisclosed.
The Tmpa Gibbons Creek Mine Dam Sp-20 stands as a critical structure in safeguarding water resources in the region, especially in managing tailings and regulating the flow of the TR-Gibbons Creek. Climate and water resource enthusiasts can appreciate the significance of this Earth dam, with its intricate design features and storage capacity, in ensuring sustainable water management practices. As efforts to enhance dam safety and emergency preparedness continue, the role of regulatory agencies like TCEQ remains pivotal in maintaining the integrity of this essential water resource infrastructure.
Year Completed |
1992 |
Dam Length |
7300 |
Dam Height |
28 |
River Or Stream |
TR-GIBBONS CREEK |
Primary Dam Type |
Earth |
Surface Area |
48.1 |
Hydraulic Height |
28 |
Drainage Area |
1.93 |
Nid Storage |
906 |
Structural Height |
28 |
Outlet Gates |
Slide (sluice gate) - 1, Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
Seasonal Comparison
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Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Tmpa Gibbons Creek Mine Dam Sp-20