Anzalduas Diversion Dam Reservoir Report
Last Updated: December 24, 2025
Anzalduas Diversion Dam, located on the Rio Grande in Hidalgo, Texas, is a concrete structure designed by MINHYDRES/BOR and completed in 1960 with a primary purpose of flood risk reduction.
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Summary
Managed by the International Boundary and Water Commission, this dam stands at a height of 23 feet, with a hydraulic height of 21 feet, and a length of 524 feet. It has a high hazard potential and a fair condition assessment as of 2007, with a controlled spillway type and a maximum discharge capacity of 130,000 cfs.
With a normal storage capacity of 10,340 acre-feet and a maximum storage of 16,400 acre-feet, Anzalduas Diversion Dam plays a crucial role in managing water resources for irrigation and flood control in the region. Although it has not been modified in recent years, the dam is inspected every five years by the US Army Corps of Engineers to ensure its structural integrity. The dam's risk assessment is categorized as very high, highlighting the importance of proper risk management measures and emergency preparedness.
Despite its age, Anzalduas Diversion Dam continues to fulfill its role in protecting the surrounding area from flooding and supporting agricultural activities through irrigation. As a key component of the water infrastructure along the Rio Grande, this dam serves as a vital resource for water resource and climate enthusiasts interested in understanding the intersection of engineering, conservation, and disaster risk reduction in the region.
Year Completed |
1960 |
Dam Length |
524 |
Dam Height |
23 |
River Or Stream |
Rio Grande |
Primary Dam Type |
Concrete |
Surface Area |
1287 |
Hydraulic Height |
21 |
Drainage Area |
176112 |
Nid Storage |
16400 |
Structural Height |
23 |
Outlet Gates |
Drum |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
23 |
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.
Anzalduas Diversion Dam