Operating Basins 1-5 Reservoir Report
Last Updated: December 18, 2025
Operating Basins 1-5, located in Calhoun, Texas, are privately owned structures regulated by the Texas Commission on Environmental Quality (TCEQ) for water resource management.
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Summary
Built in 1965 by LOCKWOOD ANDREWS & NEWMAN, these Earth-type dams stand at a height of 11.5 feet and have a storage capacity of 5702 acre-feet, serving a drainage area of 0.85 square miles. Despite lacking a spillway, the dams are rated in fair condition and undergo inspections every five years to ensure their structural integrity.
These basins, situated along the OFF CH-WEST COLOMA CREEK, play a crucial role in managing water resources in the area. With a surface area of 543 acres and a normal storage capacity of 3810 acre-feet, they are designed to mitigate flooding risks and provide essential water storage for agricultural and industrial purposes. While they have not been modified in recent years, their high risk rating of 2 underscores the importance of continued monitoring and maintenance to protect against potential hazards and ensure their long-term functionality.
Owned and operated by a private entity, Operating Basins 1-5 represent a significant investment in water infrastructure in Texas. With their strategic location and substantial storage capacity, these dams contribute to the overall water management efforts in the region, highlighting the intersection of water resources and climate resilience. As climate change impacts continue to pose challenges to water availability and quality, the proper upkeep of these structures is key to safeguarding the local community against potential water-related risks in the future.
Year Completed |
1965 |
Dam Length |
24890 |
Dam Height |
11.5 |
River Or Stream |
OFF CH-WEST COLOMA CREEK |
Primary Dam Type |
Earth |
Surface Area |
543 |
Hydraulic Height |
11.5 |
Drainage Area |
0.85 |
Nid Storage |
5702 |
Structural Height |
11.5 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North End Of Gbra Calhoun Canal Nr Long Mott
|
31cfs |
Guadalupe Rv At Sh 35 Nr Tivoli
|
472cfs |
Guadalupe Rv Nr Tivoli
|
550cfs |
Placedo Ck Nr Placedo
|
44cfs |
Guadalupe Rv Nr Bloomington
|
262cfs |
San Antonio Rv Nr Mcfaddin
|
235cfs |
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.
Operating Basins 1-5
Highway 35, Port Lavaca