West Fork One Subwatershed Site 4-4050 Reservoir Report
Last Updated: December 14, 2025
West Fork One Subwatershed Site 4-4050, located in Woodbury, Iowa, is a dam with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
Built in 1955, this earth dam stands at 29 feet high and stretches 200 feet in length, with a storage capacity of 49 acre-feet. The dam serves as a crucial infrastructure for the local community, providing essential water resource management and protection against potential hazards.
Managed by the USDA NRCS and regulated by the Iowa DNR, West Fork One Subwatershed Site 4-4050 is state-regulated and subject to inspections, permitting, and enforcement. With a low hazard potential and a moderate risk assessment rating, the dam has not been rated for its condition assessment. Despite this, it plays a vital role in mitigating flood risk and ensuring water security in the area. The dam's strategic location along the TR-WEST FORK LITTLE SIOUX RIV highlights its importance in the regional water resource management system.
As a key piece of infrastructure in the region, West Fork One Subwatershed Site 4-4050 serves as a testament to the importance of water resource management in the face of changing climate patterns. With its multiple purposes and regulated status, the dam embodies the intersection of environmental conservation and community safety, making it a focal point for water resource and climate enthusiasts alike. Its history, design, and impact on the surrounding ecosystem invite further exploration and appreciation for the intricate balance between human development and environmental stewardship.
Year Completed |
1955 |
Dam Length |
200 |
Dam Height |
29 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
1.9 |
Drainage Area |
0.18 |
Nid Storage |
49 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
West Fork Ditch At Hornick
|
80cfs |
Floyd River At James
|
187cfs |
Missouri River At Sioux City
|
13700cfs |
Omaha Cr At Homer
|
45cfs |
Maple River At Mapleton
|
323cfs |
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.
West Fork One Subwatershed Site 4-4050