Little Egypt Subwatershed Sta 174+75 #M Reservoir Report
Last Updated: December 15, 2025
The Little Egypt Subwatershed Sta 174+75 #M is a small earth dam located in Woodbury County, Iowa, near the city of ROLLY SPRINGS.
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Summary
Built in 1961 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a height of 27 feet and a length of 200 feet, the dam has a storage capacity of 95 acre-feet and covers a surface area of 7.1 acres.
This structure is owned and regulated by the local government and falls under the jurisdiction of the IOWA DNR. It is designed to be inspected, permitted, and enforced by state agencies, ensuring its safety and compliance with regulations. The dam has a low hazard potential and a moderate risk assessment rating, making it a crucial asset for water resource management in the area.
Despite not being rated for its current condition, the Little Egypt Subwatershed Sta 174+75 #M plays a significant role in the management of the TR-WEST FORK LITTLE SIOUX RIV watershed. With its strategic location and multi-purpose design, this dam contributes to the overall water security and climate resilience of the region. As a focal point for fire protection, stock, and flood risk reduction, this structure showcases the importance of sustainable water resource management in Iowa.
Year Completed |
1961 |
Dam Length |
200 |
Dam Height |
27 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
7.1 |
Drainage Area |
3.53 |
Nid Storage |
95 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Sioux City
|
14400cfs |
Omaha Cr At Homer
|
45cfs |
Floyd River At James
|
187cfs |
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.
Little Egypt Subwatershed Sta 174+75 #M