Windthorst Lake Dam Reservoir Report
Last Updated: December 5, 2025
Windthorst Lake Dam, located in Henrietta, Texas, is a vital water supply infrastructure managed by the local government.
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Summary
Constructed in 1964, this Earth-type dam stands at a height of 30.5 feet and spans a length of 910 feet, with a storage capacity of 3,268 acre-feet and a normal storage of 850 acre-feet. The dam is situated on the East-Little Post Oak Creek, serving as a critical resource for the surrounding area.
With a spillway width of 83 feet and a maximum discharge capability of 12,759 cubic feet per second, Windthorst Lake Dam has undergone modifications in 1967 and 1985 to enhance its structural integrity. Despite being classified as having a fair condition assessment, the dam is inspected every five years by the Texas Commission on Environmental Quality to ensure its safety. With a moderate risk level, the dam plays a crucial role in water management and conservation efforts in Clay County, Texas, highlighting its importance in sustaining the region's water resources amidst changing climate conditions.
Years Modified |
1967 - Other, 1985 - Structural |
Year Completed |
1964 |
Dam Length |
910 |
Dam Height |
30.5 |
River Or Stream |
EAST-LITTLE POST OAK CREEK |
Primary Dam Type |
Earth |
Surface Area |
170 |
Hydraulic Height |
30.5 |
Drainage Area |
8.4 |
Nid Storage |
3268 |
Structural Height |
30.5 |
Outlet Gates |
Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
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.
Windthorst Lake Dam