Horace Thomas Lake Dam Reservoir Report
Last Updated: December 26, 2025
Horace Thomas Lake Dam in Grimes, Texas, is a private-owned structure designed by the USDA NRCS and completed in 1969.
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Summary
This earth dam, standing at a height of 18 feet and stretching over 1010 feet, serves multiple purposes such as fire protection, stock and small fish pond management, and recreation. With a storage capacity of 192 acre-feet, the dam plays a crucial role in water resource management in the area.
Despite being non-regulated by the state, Horace Thomas Lake Dam has a high hazard potential, indicating the need for appropriate risk management measures. The dam currently lacks a condition assessment rating and Emergency Action Plan (EAP), raising concerns about its safety and preparedness in case of emergencies. With no spillway and limited inspection data available, further monitoring and assessment of this structure are essential to ensure its continued functionality and safety for the surrounding community.
Located on TR-GRASSY CREEK, this dam presents an opportunity for water resource and climate enthusiasts to engage in discussions around dam safety, risk management, and sustainable water management practices. As the primary purpose of the dam extends beyond traditional water supply, its role in supporting various activities underscores the importance of balancing human needs with environmental considerations. With its unique design features and historical significance, Horace Thomas Lake Dam offers an intriguing case study for those interested in the intersection of infrastructure, water resources, and climate resilience.
Year Completed |
1969 |
Dam Length |
1010 |
Dam Height |
18 |
River Or Stream |
TR-GRASSY CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
18 |
Nid Storage |
192 |
Structural Height |
18 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
18 |
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.
Horace Thomas Lake Dam