Mcmillan Dam Reservoir Report
Last Updated: December 20, 2025
Mcmillan Dam, located in Ransom Canyon, Texas, is a vital structure along the Double Mountain Fork Brazos River.
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Summary
Built in 1959, this Earth-type dam stands at a height of 76 feet and stretches for 1600 feet, serving primarily for recreation and water supply purposes. With a storage capacity of 8280 acre-feet and a surface area of 200 acres, the dam plays a significant role in managing the local water resources.
Managed by the Fort Worth District of the US Army Corps of Engineers, Mcmillan Dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its structural integrity. The dam's spillway, with a width of 138 feet, helps control the maximum discharge of 27520 cubic feet per second. Despite being classified as having a fair condition assessment, the dam poses a moderate risk level, indicating the importance of ongoing risk management measures to safeguard the surrounding area.
Overall, Mcmillan Dam stands as a crucial infrastructure for water resource management and recreational activities in the Lubbock area. Its historical significance, coupled with its operational capacity and regulatory oversight, highlights the importance of maintaining and monitoring such essential structures in the face of changing climate conditions and water resource management challenges.
Years Modified |
2012 - Hydraulic |
Year Completed |
1959 |
Dam Length |
1600 |
Dam Height |
76 |
River Or Stream |
DOUBLE MOUNTAIN FORK BRAZOS R |
Primary Dam Type |
Earth |
Surface Area |
200 |
Hydraulic Height |
76 |
Drainage Area |
236 |
Nid Storage |
8280 |
Structural Height |
76 |
Outlet Gates |
Slide (sluice gate) - 2, Uncontrolled - 1, Valve - 3 |
Hazard Potential |
Not Available |
Foundations |
Rock, Soil |
Nid Height |
76 |
Seasonal Comparison
Weather Forecast
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.
Mcmillan Dam