Dutch Hollow Subwatershed Site 1-5 Reservoir Report

Last Updated: December 15, 2025

Dutch Hollow Subwatershed Site 1-5, located in Woodbury County, Iowa, is a local government-owned earth dam completed in 1994 by the USDA NRCS.


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Summary

This dam serves multiple purposes, including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a height of 26 feet and a length of 1200 feet, this dam has a storage capacity of 70 acre-feet and covers a surface area of 2 acres, draining a 3.49 square mile watershed.

Managed by the Iowa DNR, Dutch Hollow Subwatershed Site 1-5 has a low hazard potential and is categorized as having a moderate risk level. While the condition of the dam has not been officially assessed, it is not currently rated. Despite the lack of recent inspection data, the dam is regulated by the state, with permitting, inspection, and enforcement processes in place. With its strategic location along the TR-Koker Creek, this dam plays a crucial role in water resource management in the region, highlighting the importance of maintaining and monitoring such structures for the resilience of local communities and ecosystems in the face of changing climate conditions.

Year Completed

1994

Dam Length

1200

Dam Height

26

River Or Stream

TR- KOKER CREEK

Primary Dam Type

Earth

Surface Area

2

Drainage Area

3.49

Nid Storage

70

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
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.