S1 Dam Reservoir Report
Nearby: S2 Dam Sediment Pond R1-A
Last Updated: December 5, 2025
S1 Dam, located in Harrison County, Texas, is a private structure with a primary purpose listed as "Other".
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Summary
The dam stands at a height of 37 feet and has a hydraulic and structural height of the same measurement. With a length of 1450 feet, this dam has a storage capacity of 281 acre-feet and a maximum discharge rate of 3077 cubic feet per second. The dam features an uncontrolled spillway with a width of 55 feet.
Despite its moderate hazard potential, the dam's condition assessment is listed as "Not Rated", indicating a lack of recent evaluation. The Emergency Action Plan (EAP) for S1 Dam was last revised in December 2010, and its compliance with guidelines and preparedness for potential emergencies remain unspecified. The risk assessment for the dam is categorized as moderate, with a DSAC (Dam Safety Action Classification) yet to be assigned. The dam is not under the jurisdiction of the U.S. Army Corps of Engineers.
Enthusiasts of water resources and climate may find S1 Dam intriguing due to its unique design as a buttress dam and the challenges posed by its uncontrolled spillway. The dam's location in Texas, with its intricate network of water bodies and potential climate-related risks, adds to the interest in monitoring and assessing the safety and effectiveness of this private structure. Further research and data collection on S1 Dam could provide valuable insights into the management of water resources and infrastructure in the region.
Dam Length |
1450 |
Dam Height |
37 |
River Or Stream |
|
Primary Dam Type |
Other |
Hydraulic Height |
37 |
Nid Storage |
281 |
Structural Height |
37 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
37 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sabine Rv Nr Beckville
|
946cfs |
Sabine Rv Nr Carthage
|
9200cfs |
Sabine Rv Bl Longview
|
656cfs |
Little Cypress Ck Nr Jefferson
|
358cfs |
Big Cypress Ck Nr Jefferson
|
97cfs |
Big Cypress Ck Abv Sh 43 Nr Karnack
|
538cfs |
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.
S1 Dam