Sediment Pond 30c Reservoir Report

Last Updated: December 5, 2025

Sediment Pond 30c, located in Atascosa, Texas, serves as a critical water resource management structure in the region.


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Summary

Owned privately, this sediment pond is primarily used for purposes other than flood control or water supply. With a dam height of 15 feet and a storage capacity of 158 acre-feet, this earth dam structure plays a crucial role in managing water flow in the area.

Constructed with stone core and soil foundation, Sediment Pond 30c has a spillway width of 27 feet and a maximum discharge capacity of 175 cubic feet per second. While the dam's hazard potential is not available, it is rated as having a moderate risk level. Despite being last inspected in 2011 and currently not rated for condition assessment, this sediment pond remains an essential component of the water infrastructure in Atascosa County.

Managed by the Mine Safety and Health Administration, Sediment Pond 30c is designed to withstand hydraulic pressures while efficiently storing and releasing water as needed. With its strategic location and moderate risk assessment, this structure continues to play a crucial role in water resource management and climate resilience efforts in the region.

Dam Length

3750

Dam Height

15

River Or Stream

Primary Dam Type

Earth

Surface Area

14.3

Hydraulic Height

15

Drainage Area

0.52

Nid Storage

158

Structural Height

15

Outlet Gates

Uncontrolled - 1

Hazard Potential

Not Available

Foundations

Soil

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.