Dry Devils And Lowrey Ws Scs Site 4 Dam Reservoir Report
Last Updated: December 22, 2025
The Dry Devils and Lowrey WS SCS Site 4 Dam, located in Sonora, Texas, along the TR-Dry Devils River, was completed in 1961 by the USDA NRCS to primarily serve as a flood risk reduction structure.
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Summary
This earth dam, with a height of 40 feet and a length of 1570 feet, has a storage capacity of 2755 acre-feet and covers a surface area of 31 acres. The dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections, with the most recent assessment in April 2021 rating its condition as fair.
The dam features an uncontrolled spillway with a width of 152 feet and outlet gates including a slide gate and two uncontrolled gates. While the hazard potential of the dam is marked as not available, a moderate risk assessment has been assigned, indicating the need for ongoing risk management measures. With a drainage area of 6.3 square miles and a maximum discharge of 7162 cubic feet per second, the dam plays a crucial role in mitigating flood risks in the region. Its location in Sutton County, Texas, highlights the importance of water resource management in arid climates like that of the region, showcasing the significance of infrastructure like the Dry Devils and Lowrey WS SCS Site 4 Dam in safeguarding communities against natural disasters.
Year Completed |
1961 |
Dam Length |
1570 |
Dam Height |
40 |
River Or Stream |
TR-DRY DEVILS RIVER |
Primary Dam Type |
Earth |
Surface Area |
31 |
Hydraulic Height |
40 |
Drainage Area |
6.3 |
Nid Storage |
2755 |
Structural Height |
40 |
Outlet Gates |
Slide (sluice gate) - 1, Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Rock, Soil |
Nid Height |
40 |
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.
Dry Devils And Lowrey Ws Scs Site 4 Dam