Windthorst Lake Dam
Windthorst Lake Dam is an earth dam located in Clay County, Texas, built in 1964. It carries a Significant hazard potential classification and has a fair condition assessment.
About Windthorst Lake Dam
The primary purpose of Windthorst Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Windthorst Water Supply Corporation (local government). It impounds the East-little Post Oak Creek near Henrietta.
The dam stands 31 feet tall and stretches 910 feet across, creates a reservoir covering 170 acres, has a maximum storage capacity of 3,268 acre-feet, and collects water from a drainage area of 8 square miles. Completed in 1964, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/31/2019.
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Location
| State | Texas |
| County | Clay |
| Nearest City | Henrietta |
| River/Stream | East-little Post Oak Creek |
| Coordinates | 33.54594, -98.39380 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 26 ft |
| Dam Length | 910 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 3,268 acre-ft |
| Max Storage | 3,268 acre-ft |
| Normal Storage | 850 acre-ft |
| Surface Area | 170 acres |
| Drainage Area | 8 sq mi |
| Max Discharge | 12,759 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | WINDTHORST WATER SUPPLY CORPORATION |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/31/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX02870 |
| Federal ID | TX02870 |
| More Info | State Dam Safety Program |