Hanlontown Slough Site 3 Reservoir Report

Last Updated: December 6, 2025

Hanlontown Slough Site 3, located in Worth County, Iowa, is a Federal-owned Fish and Wildlife Pond managed by the NRCS.


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Summary

The site, completed in 2000, serves as a crucial habitat for local wildlife, with a normal storage capacity of 121 acre-feet and a surface area of 96.5 acres. While the dam is of Earth type and has a height of 8 feet, it is considered to have a low hazard potential and is currently not rated for condition assessment.

With a drainage area of 5.3 square miles and being regulated by the Iowa DNR, Hanlontown Slough Site 3 plays a vital role in managing water resources in the region. The dam's uncontrolled spillway type and stone core make it a sustainable structure for maintaining water levels and supporting biodiversity. Despite its moderate risk assessment, the site has not been inspected recently and lacks an Emergency Action Plan, highlighting the need for continued monitoring and maintenance to ensure its long-term functionality.

Located near the TR-Willow Creek, this site is a valuable asset for conservation efforts in the area, providing a safe haven for various species of wildlife. As climate change continues to impact water resources, the importance of sites like Hanlontown Slough Site 3 in preserving ecosystems and supporting biodiversity becomes increasingly evident. It is essential for stakeholders to prioritize regular inspections and risk management measures to guarantee the sustainability and effectiveness of this critical water resource infrastructure.

Year Completed

2000

Dam Length

2367

Dam Height

8

River Or Stream

TR- WILLOW CREEK

Primary Dam Type

Earth

Surface Area

96.5

Drainage Area

5.3

Nid Storage

592

Hazard Potential

Low

Foundations

Soil

Nid Height

8
       
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.