Cassens Dam Reservoir Report

Last Updated: December 13, 2025

Located in Sigourney, Iowa, Cassens Dam is a privately owned structure designed by the USDA NRCS for fire protection, stock, or as a small fish pond.


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Summary

Completed in 1982, this earth-type dam stands at a height of 29 feet and stretches 600 feet in length, with a storage capacity of 107 acre-feet. Despite its low hazard potential, the dam is state-regulated and falls under the jurisdiction of the Iowa DNR, with regular inspections and enforcement to ensure its safety and compliance.

Sitting on the TR- Smith Creek, Cassens Dam serves as a vital resource for water management in Keokuk County, Iowa. Its primary purpose is to provide essential services such as fire protection and stock watering, while also offering recreational opportunities like fishing. The dam's location and design make it a key component in the local ecosystem, supporting wildlife and vegetation in the area.

With a moderate risk assessment rating, Cassens Dam highlights the importance of proper maintenance and management of water resources in the face of changing climate conditions. As climate enthusiasts and water resource advocates, understanding the role of structures like Cassens Dam in maintaining a sustainable water supply is crucial for preserving our environment and ensuring the resilience of communities against future challenges.

Year Completed

1982

Dam Length

600

Dam Height

29

River Or Stream

TR- SMITH CR.

Primary Dam Type

Earth

Surface Area

7.8

Drainage Area

0.11

Nid Storage

107

Hazard Potential

Low

Foundations

Soil

Nid Height

29
       
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.