Glass Ranch Big Tank Dam Reservoir Report
Last Updated: December 6, 2025
Glass Ranch Big Tank Dam in Maverick County, Texas, is a private-owned earth dam that serves multiple purposes, including water storage.
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Summary
With a height of 9.5 feet and a storage capacity of 266 acre-feet, this dam plays a crucial role in regulating water flow in the Rosita San Juan Creek. Despite being unregulated by the state, the dam is equipped with outlet gates and has a moderate surface area of 58 acres.
The dam, constructed with a buttress core type and an unknown foundation, lacks a spillway and poses a potential risk due to its high hazard rating. The condition of the dam is not rated, and there is limited data available on its inspection and maintenance history. As a significant structure in the Fort Worth District, Glass Ranch Big Tank Dam stands as a testament to the delicate balance between water resource management and climate resilience in the region.
While the dam's specific year of completion and modification remain unknown, its presence highlights the importance of sustainable water infrastructure in arid regions like Texas. As water resource and climate enthusiasts continue to monitor and assess the risk associated with dams like Glass Ranch Big Tank Dam, it underscores the need for proactive management and investment in resilient infrastructure to ensure the safety and reliability of water resources for future generations.
Dam Length |
1780 |
Dam Height |
9.5 |
River Or Stream |
ROSITA SAN JUAN CRK |
Primary Dam Type |
Earth |
Surface Area |
58 |
Nid Storage |
266 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nueces Rv Nr Asherton
|
0cfs |
Nueces Rv Bl Uvalde
|
1cfs |
Nueces Rv At Cotulla
|
0cfs |
Leona Rv Nr Uvalde
|
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.
Glass Ranch Big Tank Dam