West Sunnyside Watershed Site C-1-2 Reservoir Report

Last Updated: December 15, 2025

West Sunnyside Watershed Site C-1-2 is a key water resource in Plymouth County, Iowa, managed by the local government with oversight from the Iowa Department of Natural Resources.


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Summary

Completed in 1969, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The dam has a height of 49 feet, a length of 436 feet, and a storage capacity of 192 acre-feet, with a normal storage level of 88 acre-feet.

Located in Sioux City along TR-Broken Kettle Creek, this dam has a low hazard potential and a moderate risk assessment score of 3. While the condition assessment is currently not rated, the dam has not undergone any modifications since its construction. The spillway type is uncontrolled, indicating that water flow is not regulated, and the dam is primarily used for managing water levels and protecting against potential floods. Despite being last inspected in 1994, the West Sunnyside Watershed Site C-1-2 remains an important piece of infrastructure for water resource management in the area.

Year Completed

1969

Dam Length

436

Dam Height

49

River Or Stream

TR-BROKEN KETTLE CREEK

Primary Dam Type

Earth

Surface Area

7.1

Drainage Area

0.73

Nid Storage

192

Hazard Potential

Low

Foundations

Soil

Nid Height

49
       
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.