United Off-Channel Reservoir Dam Reservoir Report
Last Updated: December 24, 2025
The United Off-Channel Reservoir Dam located in Hidalgo, Texas, is a privately owned structure regulated by the Texas Commission on Environmental Quality.
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Summary
This earth dam stands at a height of 18 feet with a hydraulic height of 16.8 feet, serving the primary purpose of water storage on the Mission Main Canal. With a maximum storage capacity of 768 acre-feet and a normal storage of 672 acre-feet, the dam covers a surface area of 47.8 acres and has a drainage area of 49.29 square miles.
Despite being uncontrolled, the dam boasts a spillway width of 110 feet and a maximum discharge capability of 735 cubic feet per second. The risk assessment for this structure is deemed moderate, with a hazard potential that is not available and a condition assessment that is not rated. The dam has one uncontrolled outlet gate and has not been inspected or assessed for Emergency Action Plans or inundation maps, reflecting a need for further risk management measures to ensure the safety and integrity of the reservoir dam in the face of changing climate conditions.
Dam Length |
5940 |
Dam Height |
18 |
River Or Stream |
MISSION MAIN CANAL |
Primary Dam Type |
Earth |
Surface Area |
47.8 |
Hydraulic Height |
16.8 |
Drainage Area |
49.29 |
Nid Storage |
768 |
Structural Height |
18 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Not Available |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Rio Grande At Ft Ringgold
|
2110cfs |
Rio Grande Nr Brownsville
|
22cfs |
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.
United Off-Channel Reservoir Dam