East Fork Big Cr Watershed Site E-2 Reservoir Report
Last Updated: December 11, 2025
East Fork Big Cr Watershed Site E-2 is a flood risk reduction structure located in Lamoni, Iowa, within the Decatur County area.
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Summary
Managed by the USDA NRCS, this Earth dam was completed in 1990 and spans 640 feet in length with a height of 18 feet, providing a storage capacity of 88 acre-feet to mitigate flooding along the TR- East Fork Big Creek. With a drainage area of 0.26 square miles and a surface area of 4.7 acres, this site serves multiple purposes including fire protection, stock watering, and small fish pond management in addition to flood control.
This low hazard potential structure is regulated by the Iowa DNR and undergoes regular inspections and enforcement to ensure its operational effectiveness. The dam's primary purpose of flood risk reduction is supported by its design and construction, with a soil foundation and uncontrolled spillway. While the condition of the dam is currently not rated, its risk assessment is moderate, highlighting the importance of ongoing monitoring and risk management measures to uphold its functionality and safety. The East Fork Big Cr Watershed Site E-2 stands as a vital resource in safeguarding the surrounding community against potential flood events in the region.
Year Completed |
1990 |
Dam Length |
640 |
Dam Height |
18 |
River Or Stream |
TR- EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.7 |
Drainage Area |
0.26 |
Nid Storage |
88 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
East Fork Big Cr Watershed Site E-2