Blocker Lake Dam Reservoir Report
Nearby: Mitchell Lake Dam Taylor Lake Dam
Last Updated: December 5, 2025
Blocker Lake Dam, located in Harrison, Texas, was completed in 1962 and serves as a crucial water supply structure in the region.
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Summary
This private-owned dam, standing at a height of 25 feet with a length of 600 feet, primarily functions to store and regulate water from the TR-Harrison Bayou. Its design, classified as an Earth dam with a Buttress core type, showcases the engineering ingenuity of the time.
Despite its age, Blocker Lake Dam maintains a high risk assessment level, indicating the potential for hazards. The absence of a spillway and limited inspection data raises concerns about its structural integrity and safety standards. While the dam has a normal storage capacity of 120 acre-feet, it is crucial for stakeholders and regulators to conduct regular assessments and implement risk management measures to ensure the dam's reliability and resilience in the face of changing climates and water resource demands.
As enthusiasts of water resources and climate, it is vital to recognize the significance of Blocker Lake Dam in the local ecosystem and community. Understanding its purpose, design, and risk factors can inform discussions and actions towards sustainable water management practices and infrastructure improvements. By monitoring and addressing the challenges faced by Blocker Lake Dam, we can contribute to the preservation of water resources and the protection of surrounding environments for generations to come.
Year Completed |
1962 |
Dam Length |
600 |
Dam Height |
25 |
River Or Stream |
TR-HARRISON BAYOU |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
150 |
Structural Height |
25 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Cypress Ck Abv Sh 43 Nr Karnack
|
508cfs |
Little Cypress Ck Nr Jefferson
|
341cfs |
Black Cypress Bayou At Jefferson
|
243cfs |
Sabine Rv Nr Beckville
|
1090cfs |
Big Cypress Ck Nr Jefferson
|
95cfs |
Sabine Rv Nr Carthage
|
9200cfs |
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.
Blocker Lake Dam