Mackinnon Gss Reservoir Report
Last Updated: December 5, 2025
Mackinnon Gss is a privately owned earth dam located in Ellis County, Texas, designed by the USDA NRCS in 1977 for fire protection, stock, and small fish pond purposes.
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Summary
With a height of 19 feet and a length of 789 feet, the dam has a storage capacity of 117 acre-feet and serves the TR-MILL CREEK river/stream. Despite being regulated by the state with permitting and inspection requirements in place, the dam does not have a spillway and is classified as having a high risk potential.
This dam, situated in the Fort Worth District, is crucial for fire protection and recreational activities in the area. Although it lacks certain structural features, such as a spillway, the Mackinnon Gss dam plays a significant role in storing water for various purposes. As a private entity, the dam is not owned or funded by federal agencies but is subject to state regulations and inspections to ensure its safety and efficiency.
For water resource and climate enthusiasts, the Mackinnon Gss dam represents a unique engineering feat in Texas, blending functionality with environmental considerations. With its earth structure type and buttress core design, this dam stands as a testament to the importance of sustainable water management practices and the need for ongoing risk assessments and maintenance to ensure its continued effectiveness in serving the community.
Year Completed |
1977 |
Dam Length |
789 |
Dam Height |
19 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
19 |
Nid Storage |
117 |
Structural Height |
19 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
Mackinnon Gss