Fogle Lake Dam Reservoir Report
Nearby: Bentley Dam Stephens Dam
Last Updated: December 13, 2025
Fogle Lake Dam, located in Ringgold County, Iowa, was completed in 1996 and stands at a height of 36 feet with a length of 810 feet.
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Summary
The dam serves primarily for recreational purposes, providing a surface area of 41.5 acres and a normal storage capacity of 378 acre-feet. Managed by the Iowa Department of Natural Resources, the dam is regulated, inspected, and enforced by state authorities, ensuring its safe operation and maintenance.
The dam's spillway, of uncontrolled type with a width of 2 feet, contributes to its significant hazard potential. However, the condition assessment conducted in June 2017 deemed the dam satisfactory, with a moderate risk rating. The dam is situated on TR- GRAND RIVER and has a drainage area of 0.85 square miles. Despite its hazard potential, the dam remains a popular spot for recreational activities within the community of Diagonal, Iowa.
As a focal point for outdoor enthusiasts and climate advocates, Fogle Lake Dam stands as a vital resource for water storage and recreation in the region. With its state-regulated operations and satisfactory condition, the dam continues to provide essential benefits while also warranting ongoing risk management measures to ensure the safety of surrounding communities and ecosystems.
Year Completed |
1996 |
Dam Length |
810 |
Dam Height |
36 |
River Or Stream |
TR- GRAND RIVER |
Primary Dam Type |
Earth |
Surface Area |
41.5 |
Drainage Area |
0.85 |
Nid Storage |
679 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
36 |
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.
Fogle Lake Dam