Dutch Hollow Subwatershed Site 1-2 Reservoir Report
Last Updated: December 14, 2025
Dutch Hollow Subwatershed Site 1-2 in Woodbury, Iowa is a locally-owned earth dam constructed in 1989 by the USDA NRCS to serve multiple purposes such as fire protection, stock, small fish pond, and flood risk reduction.
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Summary
This dam stands at a height of 40 feet, with a length of 600 feet, and has a storage capacity of 164 acre-feet. Located along TR-Koker Creek, the dam covers a surface area of 4.4 acres and drains a 0.65 square mile watershed area.
Managed by the Iowa DNR, the Dutch Hollow Subwatershed Site 1-2 has a low hazard potential and is currently rated as not assessed for its condition. The dam's spillway type is uncontrolled, and it features no outlet gates or associated structures. While the risk assessment is moderate, with a rating of 3, the site exhibits no major concerns or issues. This dam plays a vital role in water resource management and environmental conservation efforts in the region, contributing to the overall resilience of the local ecosystem and community.
With its strategic location and design, Dutch Hollow Subwatershed Site 1-2 serves as a key infrastructure for water storage and flood risk reduction in the area. As a part of the broader water resource management plan, this dam highlights the importance of sustainable practices and proactive measures to address climate change impacts. As water resource and climate enthusiasts, we recognize the significance of such structures in preserving the natural environment and safeguarding communities against potential water-related hazards.
Year Completed |
1989 |
Dam Length |
600 |
Dam Height |
40 |
River Or Stream |
TR- KOKER CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.4 |
Drainage Area |
0.65 |
Nid Storage |
164 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Dutch Hollow Subwatershed Site 1-2