Lake Winona Dam Reservoir Report
Nearby: Spain Lake Dam G3gc Ranch Dam
Last Updated: December 6, 2025
Lake Winona Dam, located in Grimes, Texas, is a privately owned structure built in 1959 primarily for recreational purposes.
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Summary
The dam stands at a height of 19 feet and spans 500 feet in length, with a storage capacity of 297 acre-feet. Despite lacking a spillway, the dam remains a key feature along the TR-Walnut Creek, providing a picturesque setting for outdoor enthusiasts.
Although the dam's hazard potential is labeled as "Not Available," it is classified as having a high risk assessment level. However, the condition of the dam has not been rated, and the last inspection took place in 1981. The absence of an Emergency Action Plan and updated contact information raises concerns about the dam's readiness in case of emergencies. With no federal oversight or regulatory agency, the responsibility for ensuring the dam's safety and maintenance falls solely on the private owner.
For water resource and climate enthusiasts, Lake Winona Dam serves as both a recreational destination and a potential area of interest for further study on dam safety and maintenance practices. The lack of recent inspections and updated emergency procedures highlight the importance of regular monitoring and oversight to prevent any potential risks associated with the dam. As climate change continues to impact water resources, understanding the condition and management of structures like Lake Winona Dam becomes increasingly essential for ensuring the safety and sustainability of our water systems.
Year Completed |
1959 |
Dam Length |
500 |
Dam Height |
19 |
River Or Stream |
TR-WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
17.5 |
Hydraulic Height |
19 |
Nid Storage |
297 |
Structural Height |
19 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Lake Ck Nr Dobbin
|
14cfs |
Brazos Rv Nr Hempstead
|
1800cfs |
Spring Ck Nr Tomball
|
35cfs |
Dry Ck At Fm 2978
|
2cfs |
Little Cypress Ck Nr Cypress
|
41cfs |
Lake Ck At Sendera Ranch Rd Nr Conroe
|
101cfs |
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.
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Lake Winona Dam