Ralston Subwatershed Site 5-2 Reservoir Report
Last Updated: December 13, 2025
Ralston Subwatershed Site 5-2, located in Washta, Iowa, is a crucial water resource managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
This site, designed by USDA NRCS in 1969, serves multiple purposes including fire protection, stock watering, and flood risk reduction. The earth dam, standing at a height of 24 feet and spanning 757 feet in length, provides a storage capacity of 85 acre-feet and covers a surface area of 3 acres.
Despite its low hazard potential, the dam at Ralston Subwatershed Site 5-2 has not been rated for its condition. The risk assessment for this site is moderate, indicating a need for ongoing monitoring and potential risk management measures. The dam's spillway type is uncontrolled, and it is located on the TR-Little Sioux River within the Rock Island District. With a drainage area of 0.38 square miles, this site plays a crucial role in managing water resources and mitigating flood risks in the region.
Year Completed |
1969 |
Dam Length |
757 |
Dam Height |
24 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.38 |
Nid Storage |
85 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Floyd River At James
|
187cfs |
West Fork Ditch At Hornick
|
80cfs |
Maple River At Mapleton
|
323cfs |
Floyd River At Alton
|
36cfs |
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.
Ralston Subwatershed Site 5-2