Dietz Lake Dam Reservoir Report

Last Updated: December 5, 2025

Dietz Lake Dam in Guadalupe, Texas, stands as a vital structure designed by the USDA NRCS to serve multiple purposes including fire protection, stock, and small fish pond.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1973, this earth dam with a height of 25 feet and length of 400 feet provides a storage capacity of 114 acre-feet, with a normal storage level of 57 acre-feet. Situated on TR-MILL CREEK, this dam plays a crucial role in managing water resources in the region.

Despite its age, Dietz Lake Dam has not been rated for its condition, with a high risk potential identified by authorities. The dam lacks a spillway and is equipped with only one outlet gate, presenting challenges for efficient water management. While it is not regulated by the state, the dam undergoes regular inspections and permitting by Texas agencies. As a private-owned structure, its emergency action plan status and risk management measures remain unclear, pointing to potential vulnerabilities that could impact water resources and climate-related concerns.

With its unique design and historical significance, Dietz Lake Dam serves as a valuable asset for the community, contributing to water storage and wildlife conservation efforts. As water resource and climate enthusiasts continue to monitor and assess the dam's condition and risk potential, it underscores the importance of proactive maintenance and management strategies to safeguard the region's water supply and ecological balance.

Year Completed

1973

Dam Length

400

Dam Height

25

River Or Stream

TR-MILL CREEK

Primary Dam Type

Earth

Surface Area

5.2

Hydraulic Height

25

Nid Storage

114

Structural Height

25

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

25
       
Seasonal Comparison

Weather Forecast

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.