Attoyac Bayou Ws Scs Site 21 Dam Reservoir Report

Last Updated: December 5, 2025

Attoyac Bayou WS SCS Site 21 Dam is a crucial structure in Nacogdoches, Texas, designed by the USDA NRCS to mitigate flood risks along Browns Creek.


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Summary

Completed in 1977, this earth dam stands at a height of 42 feet and has a length of 1150 feet, providing a storage capacity of 2093 acre-feet. The primary purpose of the dam is flood risk reduction, with additional benefits for fire protection, stock, or small fish pond purposes.

Despite its age, the dam's condition assessment is not rated, and its hazard potential is not available. However, it is inspected periodically, with the last inspection conducted in May 2013. The risk assessment classifies the dam as high risk, emphasizing the importance of ongoing management and maintenance to ensure its safety and functionality. With state jurisdiction, regulation, permitting, and enforcement in place, the Attoyac Bayou WS SCS Site 21 Dam remains a critical asset for water resource management in the region, reflecting the collaborative efforts of local government and the NRCS.

Year Completed

1977

Dam Length

1150

Dam Height

42

River Or Stream

BROWNS CREEK

Primary Dam Type

Earth

Surface Area

20.7

Hydraulic Height

42

Drainage Area

3.81

Nid Storage

2093

Structural Height

42

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

42
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.