Kennedy & Johns Dam Reservoir Report

Last Updated: December 12, 2025

Kennedy & Johns Dam is a private earth dam located in Plymouth County, Iowa, along the TR-Floyd River.


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Summary

Constructed in 1975 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, and small fish pond. With a height of 40 feet and a length of 520 feet, Kennedy & Johns Dam has a storage capacity of 178 acre-feet and a surface area of 7.5 acres. It is regulated by the Iowa Department of Natural Resources and is considered to have a significant hazard potential.

Despite being uncontrolled, the spillway type of Kennedy & Johns Dam ensures the safety of the surrounding area in case of overflow. The dam, which is situated in a rural area near the city of James, provides essential water resources for agricultural and environmental purposes in the region. While the condition assessment is currently not rated, the risk assessment indicates a moderate level of risk (3), prompting the need for ongoing monitoring and potential risk management measures to ensure the safety and functionality of the dam for years to come.

Year Completed

1975

Dam Length

520

Dam Height

40

River Or Stream

TR-FLOYD RIVER

Primary Dam Type

Earth

Surface Area

7.5

Drainage Area

0.87

Nid Storage

178

Hazard Potential

Significant

Foundations

Soil

Nid Height

40
       
Seasonal Comparison

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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.