Whiskey Hollow Watershed - Lewis Site Reservoir Report

Last Updated: December 13, 2025

The Whiskey Hollow Watershed - Lewis Site is a key water resource in Louisa, Iowa, managed by the local government and designed by USDA NRCS.


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Summary

The dam, completed in 1986, serves multiple purposes including fire protection, stock maintenance, and flood risk reduction. With a height of 33 feet and a storage capacity of 110 acre-feet, the dam covers a surface area of 5.8 acres and has a drainage area of 0.55 square miles.

Located in Muscatine Slough along the TR-Muscatine Slough river, the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Although the risk assessment indicates a moderate level of risk, the dam has not been modified in recent years and does not have an Emergency Action Plan (EAP) in place. Despite these factors, the Whiskey Hollow Watershed - Lewis Site remains an important asset for water management and conservation efforts in Iowa.

Managed by the Iowa Department of Natural Resources, this dam plays a crucial role in water resource management and ecosystem protection in the region. With its earth dam structure and uncontrolled spillway type, the Whiskey Hollow Watershed - Lewis Site represents a blend of traditional engineering and environmental stewardship. For water resource and climate enthusiasts, this site offers a fascinating case study in sustainable water infrastructure and the importance of balancing human needs with ecological considerations.

Year Completed

1986

Dam Length

270

Dam Height

33

River Or Stream

TR- MUSCATINE SLOUGH

Primary Dam Type

Earth

Surface Area

5.8

Drainage Area

0.55

Nid Storage

110

Hazard Potential

Low

Foundations

Soil

Nid Height

33
       
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.