Sedimentation Pond No 21 Reservoir Report

Last Updated: December 5, 2025

Sedimentation Pond No 21 in Donie, Texas, is a privately owned earth dam structure built in 1988 on the TR-Buffalo Creek.


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Summary

With a height of 26 feet and a length of 2200 feet, this pond serves a primary purpose of sedimentation and storage with a capacity of 327 acre-feet. Despite being unregulated by the state, the dam is designed with an uncontrolled spillway and two outlet gates.

The last inspection of Sedimentation Pond No 21 was conducted in March 2009, with an inspection frequency of every 5 years. While the hazard potential is not available and the condition remains unrated, the risk assessment indicates a moderate level of risk. The Mine Safety and Health Administration oversees the regulatory and inspection aspects of the dam, ensuring its safe operation.

Located within the Fort Worth District of the US Army Corps of Engineers, Sedimentation Pond No 21 offers a modest surface area of 27 acres and serves as a crucial water resource for the local community. Despite its unregulated status, the dam's design and construction meet industry standards, providing effective sedimentation and storage capabilities for the surrounding area.

Year Completed

1988

Dam Length

2200

Dam Height

26

River Or Stream

TR-BUFFALO CREEK

Primary Dam Type

Earth

Surface Area

27

Hydraulic Height

26

Drainage Area

0.7

Nid Storage

327

Structural Height

26

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

26
       
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.