Washburn Subwatershed Sta28+00 Gully3 Reservoir Report
Last Updated: December 15, 2025
Located in Woodbury, Iowa, the Washburn Subwatershed Sta28+00 Gully3 is a key water resource managed by local government authorities.
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Summary
This dam, completed in 1960, serves multiple purposes including fire protection, small fish pond management, and flood risk reduction. With a height of 32 feet and a length of 300 feet, the dam holds a storage capacity of 29 acre-feet and covers a surface area of 4.8 acres.
Managed by the Iowa Department of Natural Resources, the Washburn Subwatershed Sta28+00 Gully3 is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. Despite its low hazard potential and a moderate risk assessment rating, the dam's condition is currently not rated. The dam's spillway is uncontrolled, with no outlet gates or locks, and no recent inspection or assessment data available.
Supported by the USDA NRCS, this water management structure is integral to the TR-GARRETSON DITCH watershed, providing essential water resource management in the region. As an earth dam primarily built on soil foundations, the Washburn Subwatershed Sta28+00 Gully3 plays a crucial role in mitigating flood risks, protecting local agriculture, and sustaining the ecosystem in the surrounding area.
Year Completed |
1960 |
Dam Length |
300 |
Dam Height |
32 |
River Or Stream |
TR-GARRETSON DITCH |
Primary Dam Type |
Earth |
Surface Area |
4.8 |
Drainage Area |
0.57 |
Nid Storage |
29 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Omaha Cr At Homer
|
45cfs |
Missouri River At Sioux City
|
14400cfs |
Floyd River At James
|
187cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Washburn Subwatershed Sta28+00 Gully3