Patterson Lake No 1 Dam Reservoir Report
Last Updated: December 5, 2025
Patterson Lake No 1 Dam, located in Throckmorton, Texas, was completed in 1966 and stands at a height of 20 feet with a length of 560 feet.
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Summary
The dam is primarily used for purposes other than flood control or water supply, with a storage capacity of 312 acre-feet. Situated on TR-North Elm Creek, this earth dam with buttress core type has a hazard potential of "Not Available" and a risk assessment rating of "High (2)".
Owned privately, the dam is not regulated by the state and does not have a designated state regulatory agency. However, it is subject to state permitting and inspection requirements. Despite its age, the condition of the dam is currently not rated, and there is no emergency action plan (EAP) in place. The absence of spillways and locks indicates the dam's limited capacity to manage high discharge events, posing a potential risk to the surrounding area in case of a breach.
Enthusiasts interested in water resource management and climate adaptation may find Patterson Lake No 1 Dam a compelling case study due to its unique design features, historical significance, and potential risks associated with its current condition. The dam's location in a high-risk area and its lack of comprehensive risk management measures highlight the importance of proactive monitoring and maintenance to ensure the safety and integrity of essential water infrastructure in the face of changing climate conditions.
Year Completed |
1966 |
Dam Length |
560 |
Dam Height |
20 |
River Or Stream |
TR-NORTH ELM CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
312 |
Structural Height |
20 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Millers Ck Nr Munday
|
0cfs |
Clear Fk Brazos Rv At Ft Griffin
|
19cfs |
Brazos Rv At Seymour
|
35cfs |
Brazos Rv Nr South Bend
|
27cfs |
Hubbard Ck Bl Albany
|
0cfs |
California Ck Nr Stamford
|
2cfs |
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.
Patterson Lake No 1 Dam