Roy Jennings Lake Dam Reservoir Report
Last Updated: December 19, 2025
Roy Jennings Lake Dam, located in Zapata, Texas, is a private-owned structure built in 1972 primarily for water supply purposes.
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Summary
The dam, which stands at a height of 22 feet and spans 1650 feet in length, was designed as an Earth dam with a Buttress core type. It boasts a storage capacity of 313 acre-feet, with a normal storage level of 185 acre-feet, covering a surface area of 26 acres.
Despite its age, the dam has not been rated for its condition, with no recent inspection data available. However, its hazard potential is noted as "Not Available," and it is categorized as having a high risk level. Interestingly, the dam does not have a spillway and is equipped with only one outlet gate. With its importance in providing water supply to the region, enthusiasts of water resources and climate will find Roy Jennings Lake Dam a significant structure to monitor and study for its impact on the local ecosystem and water management practices.
Year Completed |
1972 |
Dam Length |
1650 |
Dam Height |
22 |
River Or Stream |
LOS OVEJO CREEK |
Primary Dam Type |
Earth |
Surface Area |
26 |
Hydraulic Height |
22 |
Nid Storage |
313 |
Structural Height |
22 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rio Grande At Laredo
|
1760cfs |
Zacate Ck At Laredo
|
0cfs |
Rio Grande At Ft Ringgold
|
2110cfs |
San Casimiro Ck Nr Freer
|
0cfs |
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.
Roy Jennings Lake Dam