Seven H Ranch Lake Dam Reservoir Report
Last Updated: December 5, 2025
Seven H Ranch Lake Dam, located in Wimberley, Texas, serves as a crucial water supply source in Hays County.
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Summary
Built in 1963, this earth dam stands at a height of 21 feet and has a length of 894 feet, with a storage capacity of 168 acre-feet. The primary purpose of the dam is to ensure water availability for the surrounding area, particularly during dry periods.
The dam, situated on TR-Wanslow Creek, features an uncontrolled spillway with a width of 70 feet and one uncontrolled outlet gate. Despite being privately owned, the dam is subject to state permitting, inspection, and enforcement. While its hazard potential is not available and its condition is not rated, a moderate risk assessment has been assigned to the structure.
Overall, Seven H Ranch Lake Dam stands as a vital infrastructure for water resource management in the region, contributing to the stability and resilience of the local water supply system. With its strategic location and operational functionality, the dam plays a key role in ensuring water availability for agricultural, residential, and recreational purposes in Hays County.
Year Completed |
1963 |
Dam Length |
894 |
Dam Height |
21 |
River Or Stream |
TR-WANSLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
21 |
Drainage Area |
0.69 |
Nid Storage |
168 |
Structural Height |
21 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
21 |
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.
Seven H Ranch Lake Dam