S7 Dam Reservoir Report
Nearby: S6 Dam S4 Sediment Pond Dam
Last Updated: December 5, 2025
S7 Dam, located in Harrison, Texas, is a privately owned structure with a primary purpose classified as 'Other'.
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Summary
This buttress dam stands at a height of 19 feet and has a length of 1600 feet, providing a maximum storage capacity of 57 acre-feet. With a spillway width of 76 feet and an uncontrolled spillway type, the dam has a maximum discharge capacity of 4091 cubic feet per second.
Despite not being regulated or inspected by the state, S7 Dam has been assessed to have a moderate risk level. The Emergency Action Plan (EAP) for the dam was last revised in December 2010, indicating a need for updated emergency preparedness measures. The dam's hazard potential and condition assessment are currently listed as 'Not Available' and 'Not Rated', respectively, highlighting the importance of ongoing monitoring and maintenance to ensure community safety and water resource sustainability in the region.
With the increasing focus on climate change and water resource management, S7 Dam serves as a crucial infrastructure contributing to flood control and water storage in the area. As enthusiasts and stakeholders in water resource and climate issues, it is essential to track the condition and risk assessment of dams like S7 to support informed decision-making and proactive measures for sustainable water management in Texas.
Dam Length |
1600 |
Dam Height |
19 |
River Or Stream |
|
Primary Dam Type |
Other |
Hydraulic Height |
19 |
Nid Storage |
57 |
Structural Height |
19 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sabine Rv Nr Beckville
|
946cfs |
Sabine Rv Nr Carthage
|
9200cfs |
Little Cypress Ck Nr Jefferson
|
358cfs |
Sabine Rv Bl Longview
|
656cfs |
Big Cypress Ck Abv Sh 43 Nr Karnack
|
538cfs |
Big Cypress Ck Nr Jefferson
|
97cfs |
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.
S7 Dam