Operating Basin No 6 Levee Reservoir Report
Last Updated: December 18, 2025
Operating Basin No 6 Levee, located in Calhoun, Texas, is a privately owned structure designed by Lockwood Andrews & Newman with a height of 11 feet and a length of 10,450 feet.
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Summary
Completed in 1968, this earth-type levee serves a variety of purposes, including flood control and water storage, with a normal storage capacity of 586 acre-feet and a maximum storage capacity of 1,004 acre-feet. Despite its fair condition assessment in 2017, the levee is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections every five years to ensure its structural integrity.
Situated off the CH-Guadalupe River, Operating Basin No 6 Levee plays a crucial role in managing water resources in the area, providing protection against potential flooding events. With a high risk assessment level of 2, the levee has not been assigned a Dam Safety Action Classification (DSAC) date, indicating that risk management measures may need to be implemented in the future. Despite its lack of a spillway and limited discharge capacity, the levee remains a vital asset in the region's water infrastructure, with a surface area of 121 acres and a drainage area of 0.19 square miles.
As a key component of the Fort Worth District's water management system, Operating Basin No 6 Levee serves as a critical line of defense against flooding and water-related hazards. With its strategic location and important role in water storage and control, this earth-type levee stands as a testament to the ongoing efforts to mitigate the impacts of climate change and ensure the sustainable management of water resources in the region.
Year Completed |
1968 |
Dam Length |
10450 |
Dam Height |
11 |
River Or Stream |
OFF CH-GUADALUPE RIVER |
Primary Dam Type |
Earth |
Surface Area |
121 |
Hydraulic Height |
11 |
Drainage Area |
0.19 |
Nid Storage |
1004 |
Structural Height |
11 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
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 Basin No 6 Levee
Highway 35, Port Lavaca