Brantley Dam Reservoir Report

Last Updated: December 8, 2025

Brantley Dam, located in Lucas County, Iowa, was completed in 1979 and is primarily used for fire protection, stock, or as a small fish pond.


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Summary

The dam stands at 35 feet high and spans a length of 290 feet, with a storage capacity of 52 acre-feet. It is classified as an earth dam with a soil foundation and is regulated by the Iowa Department of Natural Resources.

The dam is situated on TR-Mill Branch Creek and serves as a crucial water resource for the surrounding area. Despite its low hazard potential and moderate risk assessment, the dam is not currently rated for its condition. It is owned privately and falls under the jurisdiction of the state, with regular inspections and enforcement conducted by the Iowa DNR to ensure its safety and functionality.

With its strategic location and important role in providing water for various purposes, Brantley Dam is a key feature in the local landscape. Water resource and climate enthusiasts can appreciate the efforts of the USDA NRCS in designing and maintaining this vital infrastructure, which contributes to the resilience and sustainability of the region's water supply.

Year Completed

1979

Dam Length

290

Dam Height

35

River Or Stream

TR-MILL BRANCH CREEK

Primary Dam Type

Earth

Surface Area

4

Drainage Area

0.16

Nid Storage

52

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
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.