Dullnig Lake Dam Reservoir Report

Last Updated: December 6, 2025

Dullnig Lake Dam, located in Dimmit, Texas, is a private structure built in 1959 for the primary purpose of water supply.


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Summary

Standing at 17 feet high and 600 feet long, this earth dam with a buttress core holds a maximum storage capacity of 190 acre-feet, with a normal storage level of 53 acre-feet. Despite being non-Federal and not state-regulated, the dam is subject to state permitting and inspection requirements.

Situated on the TR-San Lorenzo Creek, Dullnig Lake Dam has no spillway and is equipped with one outlet gate. The dam poses a high risk level due to its hazard potential being not available and its condition not rated. Although emergency action and risk management measures are not detailed, the dam's risk assessment emphasizes the need for proactive monitoring and maintenance to ensure its safety and longevity for the surrounding community's water supply needs.

With its captivating history and crucial role in sustaining water resources in the region, Dullnig Lake Dam serves as a reminder of the intricate balance between human development and environmental conservation. As water resource and climate enthusiasts explore the intricacies of this privately owned structure, they are reminded of the importance of responsible stewardship to protect our valuable water sources for future generations.

Year Completed

1959

Dam Length

600

Dam Height

17

River Or Stream

TR-SAN LORENZO CREEK

Primary Dam Type

Earth

Surface Area

12

Hydraulic Height

17

Nid Storage

190

Structural Height

17

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

17
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.