Masek Dam Reservoir Report

Last Updated: December 5, 2025

Masek Dam, located in Winneshiek County, Iowa, along the Turkey River, was completed in 2001 by the NRCS.


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Summary

This privately owned earth dam stands at a height of 25 feet and serves multiple purposes including fire protection, stock, and small fish pond. With a storage capacity of 71 acre-feet and a surface area of 3.5 acres, Masek Dam plays a crucial role in water resource management in the area.

Despite being classified as having a low hazard potential, Masek Dam is considered to have a moderate risk level. The dam, made of stone core and soil foundation, is state-regulated and undergoes regular inspections, permitting, and enforcement by the Iowa DNR. The dam does not have a spillway and is categorized as uncontrolled, highlighting the importance of proper maintenance and monitoring to ensure its structural integrity and safety.

With its strategic location and key role in water storage and management, Masek Dam is a vital asset for the local community in Ft. Atkinson. As climate change continues to impact water resources, dams like Masek play a crucial role in mitigating risks and ensuring water security for both human and environmental needs. The dam's construction and ongoing maintenance reflect a commitment to sustainable water resource management in the face of evolving climatic challenges.

Year Completed

2001

Dam Length

293

Dam Height

25

River Or Stream

TR- TURKEY RIVER

Primary Dam Type

Earth

Surface Area

3.5

Drainage Area

0.55

Nid Storage

71

Hazard Potential

Low

Foundations

Soil

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.