Blanco City Dam No 1 Reservoir Report
Last Updated: December 5, 2025
Blanco City Dam No 1, located in Blanco, Texas on the Blanco River, was completed in 1957 and serves as a vital water supply infrastructure for the local community.
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Summary
Designed by Montgomery & Williams, this buttress-type dam stands at a height of 12 feet and spans 300 feet in length, with a storage capacity of 69 acre-feet. Despite being state regulated by the Texas Commission on Environmental Quality (TCEQ), the dam's condition is currently not rated, and its hazard potential is labeled as "Not Available."
With Chip Roy as the Congressional Representative for the area, Blanco City Dam No 1 plays a crucial role in water resource management for the region. While it lacks a spillway and has no associated structures, the dam's risk assessment is classified as "High (2)" due to its outdated last inspection date in 1979. As climate change continues to impact water resources, ensuring the safety and functionality of dams like Blanco City Dam No 1 is essential for sustainable water supply and management in the face of evolving environmental challenges.
Year Completed |
1957 |
Dam Length |
300 |
Dam Height |
12 |
River Or Stream |
BLANCO RIVER |
Primary Dam Type |
Buttress |
Hydraulic Height |
12 |
Nid Storage |
69 |
Structural Height |
12 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Blanco City Dam No 1