Elkhorn No.2 Subwatershed 1-5000 Reservoir Report
Last Updated: December 14, 2025
Located in Plymouth, Iowa, the Elkhorn No.2 Subwatershed 1-5000 is a local government-owned structure designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1961, this earth dam stands at a height of 27 feet and has a storage capacity of 22 acre-feet. With a low hazard potential and moderate risk assessment, the dam serves as a flood risk reduction measure for the TR-West Fork Little Sioux River.
Managed by the Iowa DNR, the Elkhorn No.2 Subwatershed 1-5000 plays a crucial role in maintaining the water resources in the area. Despite not being currently rated, the dam's condition is assessed as not rated, highlighting the need for further evaluation and potential improvements. With a drainage area of 0.25 square miles and a surface area of 2 acres, this structure contributes to the overall water management efforts in the region.
As part of the Omaha District, the Elkhorn No.2 Subwatershed 1-5000 is a key component in the water infrastructure network of the area. With its primary purpose being fire protection and stock maintenance, the dam also serves as a valuable asset for flood risk reduction. With state-regulated permitting, inspection, and enforcement in place, this structure ensures the safety and sustainability of the surrounding water resources for both present and future generations.
Year Completed |
1961 |
Dam Height |
27 |
River Or Stream |
TR- WEST FORK LITTLE SIOUX R. |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.25 |
Nid Storage |
22 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Floyd River At James
|
187cfs |
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.
Elkhorn No.2 Subwatershed 1-5000