West Fork One Subwatershed Site 2-10110 Reservoir Report

Last Updated: December 15, 2025

West Fork One Subwatershed Site 2-10110 in Woodbury County, Iowa, is a crucial water resource managed by the local government for fire protection, stocking, and small fish pond purposes.


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Summary

Constructed in 1955 by the USDA NRCS, this earth dam stands at a height of 29 feet and has a storage capacity of 51 acre-feet, serving a drainage area of 0.26 square miles. Located in Rolly Springs along the TR-West Fork Little Sioux River, this dam plays a vital role in flood risk reduction for the surrounding area.

Despite its low hazard potential, the condition of West Fork One Subwatershed Site 2-10110 has not been rated, and there is no recent inspection data available. However, the risk assessment for this dam is moderate, indicating the need for continued monitoring and potentially implementing risk management measures in the future. With the Iowa DNR as the regulatory agency and state permitting and inspection in place, this site remains under state jurisdiction and oversight to ensure its safety and functionality for the community and the environment.

Year Completed

1955

Dam Length

300

Dam Height

29

River Or Stream

TR-WEST FORK LITTLE SIOUX RIV

Primary Dam Type

Earth

Surface Area

1.5

Drainage Area

0.26

Nid Storage

51

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.