Little Egypt Subwatershed Sta 125+21 #M Reservoir Report
Last Updated: December 14, 2025
Little Egypt Subwatershed Sta 125+21 #M is a vital water resource in Woodbury County, Iowa, designed by the USDA NRCS and regulated by the Iowa DNR.
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Summary
Completed in 1961, this earth dam serves multiple purposes, including fire protection, stock watering, small fish pond management, and flood risk reduction. With a dam height of 39 feet and a storage capacity of 249 acre-feet, this structure covers a drainage area of 1.19 square miles and provides a surface area of 9.9 acres.
Located in ROLLY SPRINGS, Iowa, this dam on TR-WEST FORK LITTLE SIOUX RIV falls under the jurisdiction of the state regulatory agency and undergoes regular inspection and enforcement. With a low hazard potential and a moderate risk assessment rating of 3, Little Egypt Subwatershed Sta 125+21 #M is an essential component of the local water infrastructure. While the condition assessment is currently not rated, the dam continues to play a crucial role in ensuring water resource management and protection in the region.
Maintaining a balance between water resource utilization and environmental conservation, Little Egypt Subwatershed Sta 125+21 #M stands as a testament to effective collaboration between local government agencies and conservation authorities. As climate change impacts water availability and quality, the significance of well-designed structures like this earth dam becomes increasingly evident in safeguarding communities against floods, ensuring sustainable water supply for various needs, and supporting the local ecosystem.
Year Completed |
1961 |
Dam Length |
350 |
Dam Height |
39 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
9.9 |
Drainage Area |
1.19 |
Nid Storage |
249 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
Missouri River At Sioux City
|
13700cfs |
Omaha Cr At Homer
|
45cfs |
Maple River At Mapleton
|
323cfs |
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 125+21 #M