Little Egypt Subwatershed Sta 29+82 #M Reservoir Report
Last Updated: December 14, 2025
The Little Egypt Subwatershed Sta 29+82 #M is a vital water resource located in Woodbury County, Iowa, specifically in Rolly Springs.
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Summary
Owned by the local government, this structure serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. Built in 1961 by the USDA NRCS, this earthen dam stands at 36 feet high and has a length of 425 feet, providing a storage capacity of 53 acre-feet for the TR-West Fork Little Sioux River.
Managed by the Iowa DNR, this dam has a low hazard potential and a moderate risk assessment rating. With a drainage area of 0.27 square miles, this structure plays a crucial role in controlling water flow and reducing flood risks in the area. Although its condition assessment is not rated, it is regularly inspected, permitted, and regulated by state authorities to ensure its effectiveness and safety.
For water resource and climate enthusiasts, the Little Egypt Subwatershed Sta 29+82 #M represents a key infrastructure in managing water resources and mitigating flood risks in the region. With its strategic location and multiple purposes, this dam serves as a valuable asset in protecting the surrounding community and ecosystem from potential water-related disasters. Its management by the Iowa DNR and USDA NRCS highlights the collaboration between state and federal agencies in safeguarding our water resources and enhancing resilience to climate variability.
Year Completed |
1961 |
Dam Length |
425 |
Dam Height |
36 |
River Or Stream |
TR-WEST FORK LITTLE SIOUX RIV |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.27 |
Nid Storage |
53 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Sioux City
|
13700cfs |
Floyd River At James
|
187cfs |
Omaha Cr At Homer
|
45cfs |
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
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 29+82 #M