Calvert Mine Spc-4 Dam Reservoir Report
Last Updated: December 5, 2025
Calvert Mine Spc-4 Dam, located in Robertson County, Texas, was designed by Nationwide Water Resources Services, Inc.
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Summary
in 1991 for the primary purpose of tailings storage. This earth dam stands at a height of 19.1 feet and has a storage capacity of 159 acre-feet, with a surface area of 11.95 acres. The dam is situated on TR-Big Willow Creek and is under the jurisdiction of the Galveston District of the US Army Corps of Engineers.
The dam features an uncontrolled spillway with a width of 20 feet and two uncontrolled outlet gates. Although the hazard potential and condition assessment are not available, the risk assessment for this dam is moderate. It has not been rated for its condition, but it has undergone modifications in 2002. Despite not being state-regulated, the dam is subject to state permitting and inspection requirements. The dam's risk management measures and emergency preparedness details are not specified, but it is essential to monitor and maintain this structure to ensure its safety and effectiveness in managing water resources and climate impacts in the region.
Overall, the Calvert Mine Spc-4 Dam serves a critical function in storing tailings and managing water flow in the area. With its moderate risk assessment, it is vital for the owner, a private entity, to adhere to inspection protocols and implement necessary risk management measures. This dam's capacity and design contribute to the overall water resource infrastructure in Robertson County, emphasizing the importance of maintaining and monitoring such structures for the preservation of water resources and climate resilience in the region.
Years Modified |
2002 - Other |
Year Completed |
1991 |
Dam Length |
1820 |
Dam Height |
19.1 |
River Or Stream |
TR-BIG WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
11.95 |
Hydraulic Height |
19.1 |
Drainage Area |
0.33 |
Nid Storage |
159 |
Structural Height |
19.1 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Calvert Mine Spc-4 Dam