Robeson Subwatershed Gully 3 Sta92+50 Reservoir Report
Last Updated: December 13, 2025
Robeson Subwatershed Gully 3 Sta92+50 is a dam located in the Cherokee County of Iowa, specifically in the city of Washta.
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Summary
Built in 1955 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction. With a height of 45 feet and a length of 420 feet, the dam has a storage capacity of 196 acre-feet and covers a surface area of 6.1 acres, draining a 0.72 square mile drainage area into the TR-Willow Creek.
Managed by the Iowa Department of Natural Resources, Robeson Subwatershed Gully 3 Sta92+50 has a low hazard potential and a moderate risk assessment rating. Although the dam's condition has not been officially rated, it is inspected regularly and falls under state jurisdiction for permitting, inspection, and enforcement. While it does not have an Emergency Action Plan (EAP) in place, the dam is designed to safely manage water flow and reduce the risk of flooding in the area. Overall, this structure plays a critical role in water resource management and climate resilience efforts in the region.
Year Completed |
1955 |
Dam Length |
420 |
Dam Height |
45 |
River Or Stream |
TR-WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.1 |
Drainage Area |
0.72 |
Nid Storage |
196 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Floyd River At Alton
|
36cfs |
Floyd River At James
|
187cfs |
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Perry Creek Near Milnerville
|
25cfs |
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.
Robeson Subwatershed Gully 3 Sta92+50