Calvert Mine Spc 18 Dam Reservoir Report
Last Updated: December 5, 2025
The Calvert Mine Spc 18 Dam, located in Robertson County, Texas, was completed in 1992 and serves as a tailings dam along Walnut Creek.
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Summary
Designed by NATIONWIDE WATER RESOURCES SERVICES, INC, this private-owned earth dam stands at a height of 28 feet with a length of 1000 feet. It has a storage capacity of 238 acre-feet, with a normal storage level of 103 acre-feet and a surface area of 16.7 acres.
The dam features an uncontrolled spillway with a width of 350 feet and four uncontrolled outlet gates. Despite being classified as a moderate risk (3), the hazard potential and condition assessment of the dam are currently not available or rated. The last inspection date was in 2008, with no specified inspection frequency or condition assessment date provided. The dam is not regulated by the state and does not have a designated emergency action plan or inundation maps prepared.
For water resource and climate enthusiasts, the Calvert Mine Spc 18 Dam presents an intriguing case study of a privately-owned tailings dam in Texas, surrounded by the beauty and challenges of Walnut Creek. With a moderate risk classification and limited regulatory oversight, the dam's maintenance and emergency preparedness are areas of interest and potential concern. Further research and monitoring of this dam's condition and management measures could provide valuable insights into the intersection of water resources, climate resilience, and infrastructure safety in the region.
Year Completed |
1992 |
Dam Length |
1000 |
Dam Height |
28 |
River Or Stream |
TR-WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
16.7 |
Hydraulic Height |
28 |
Drainage Area |
0.54 |
Nid Storage |
238 |
Structural Height |
28 |
Outlet Gates |
Uncontrolled - 4 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Brazos Rv Nr Highbank
|
213cfs |
Little Brazos Rv At Fm 485 Nr Hearne
|
564cfs |
Little Pond Ck Nr Burlington
|
0cfs |
Navasota Rv Nr Easterly
|
22cfs |
Big Elm Ck At Sh 77 Nr Cameron
|
940cfs |
Little Rv At Cameron
|
165cfs |
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 18 Dam