Biel Lake South Dam Reservoir Report
Last Updated: December 5, 2025
Biel Lake South Dam, located in Webb County, Texas, is a privately owned structure that serves multiple purposes, including water storage.
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Summary
This earth dam, with a height of 9.5 feet, has a storage capacity of 355 acre-feet and a normal storage level of 90 acre-feet. The dam is situated on TR-Alamito Creek and is managed by the Galveston District of the US Army Corps of Engineers.
Despite its relatively small size, Biel Lake South Dam poses a high risk (2) due to its condition assessment being "not rated" and its hazard potential being labeled as "not available." The dam does not have a spillway and is not regulated by the state. With no recent inspection date or emergency action plan in place, there is a need for increased monitoring and risk management measures to ensure the safety and stability of the structure for both water resource management and climate resilience in the region.
Dam Height |
9.5 |
River Or Stream |
TR-ALAMITO CREEK |
Primary Dam Type |
Earth |
Surface Area |
30 |
Nid Storage |
355 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
San Casimiro Ck Nr Freer
|
0cfs |
Zacate Ck At Laredo
|
0cfs |
Rio Grande At Laredo
|
1760cfs |
Nueces Rv Nr Tilden
|
0cfs |
Nueces Rv At Cotulla
|
0cfs |
Frio Rv At Tilden
|
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.
Biel Lake South Dam