Arlington Subwatershed Sta 38+80 #11 Reservoir Report
Last Updated: December 15, 2025
Arlington Subwatershed Sta 38+80 #11 is a dam located in Plymouth County, Iowa, specifically in the city of Moville.
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Summary
Built in 1965 by the USDA NRCS, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 29 feet and a length of 406 feet, the dam has a storage capacity of 76 acre-feet and covers a surface area of 4.5 acres.
Managed by the Iowa Department of Natural Resources, Arlington Subwatershed Sta 38+80 #11 is regulated, permitted, inspected, and enforced by state agencies. The dam poses a low hazard potential and is currently deemed to be in a moderate risk category. While the condition assessment is listed as "Not Rated", the dam's risk management measures and emergency action plan status are not specified. Despite its uncontrolled spillway type, the dam has not experienced any reported incidents of maximum discharge.
For water resource and climate enthusiasts, Arlington Subwatershed Sta 38+80 #11 represents an essential infrastructure piece in the TR-W Fork Little Sioux River watershed. With its multiple intended uses and regulatory oversight, this dam serves as a key asset in managing water resources, protecting against floods, and supporting local ecosystems. Further monitoring and assessment will be crucial to ensure the continued safety and effectiveness of this important structure.
Year Completed |
1965 |
Dam Length |
406 |
Dam Height |
29 |
River Or Stream |
TR-W FORK LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
4.5 |
Drainage Area |
0.55 |
Nid Storage |
76 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Floyd River At James
|
187cfs |
Little Sioux River At Correctionville
|
327cfs |
Perry Creek Near Milnerville
|
25cfs |
Missouri River At Sioux City
|
13700cfs |
West Fork Ditch At Hornick
|
80cfs |
Floyd River At Alton
|
36cfs |
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.
Arlington Subwatershed Sta 38+80 #11