East Fork Big Cr Watershed Site E-5 Reservoir Report
Last Updated: December 11, 2025
Located in Lamoni, Iowa, the East Fork Big Cr Watershed Site E-5 is a flood risk reduction structure designed by the USDA NRCS in 1990.
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Summary
This earth dam stands at a height of 14 feet and spans 515 feet, with a storage capacity of 97 acre-feet. Serving multiple purposes such as fire protection, stock, or small fish pond, the primary purpose of this dam is flood risk reduction, safeguarding the surrounding area from potential inundation.
Managed by the Iowa DNR and with state jurisdiction and regulatory oversight, this dam is classified as having a low hazard potential and a moderate risk assessment. Despite not having a condition rating, the structure is regularly inspected, permitted, and enforced upon to ensure its functionality and safety. The 6.8-acre surface area and 0.29 square miles drainage area of the dam play a crucial role in water resource management and climate resilience in Decatur County, Iowa.
With a spillway type of 'Uncontrolled' and no associated locks or gates, the East Fork Big Cr Watershed Site E-5 serves as a vital infrastructure for flood control and water conservation in the region. As water resource and climate enthusiasts, understanding the design, functionality, and regulatory framework of such structures is essential in ensuring sustainable water management and environmental protection in the face of changing climate patterns.
Year Completed |
1990 |
Dam Length |
515 |
Dam Height |
14 |
River Or Stream |
TR- EAST FORK BIG CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.8 |
Drainage Area |
0.29 |
Nid Storage |
97 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
14 |
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-5