Lake Lashane Dam Reservoir Report
Last Updated: December 11, 2025
Lake Lashane Dam, located in Lamoni, Iowa, was completed in 1954 by the Stanley Engineering Co.
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Summary
The dam stands at a height of 30 feet and has a length of 1000 feet, creating a reservoir with a normal storage capacity of 559 acre-feet. The dam's primary purpose is water supply, serving as a crucial resource for the local community.
Managed by the Iowa Department of Natural Resources, the Lake Lashane Dam is regulated, inspected, and enforced by state authorities to ensure its structural integrity and safety. With a significant hazard potential but a satisfactory condition assessment, the dam poses moderate risks that are continuously monitored and managed by relevant agencies. In the event of an emergency, the dam has established protocols for risk assessment and response.
As a key structure on TR- Shane Creek in Decatur County, Iowa, Lake Lashane Dam plays a vital role in water resource management and climate resilience efforts in the region. With its uncontrolled spillway and soil foundation, the dam serves as a critical infrastructure for water supply while also providing recreational opportunities and environmental benefits to the local community and wildlife.
Year Completed |
1954 |
Dam Length |
1000 |
Dam Height |
30 |
River Or Stream |
TR- SHANE CREEK |
Primary Dam Type |
Earth |
Surface Area |
100 |
Drainage Area |
4.18 |
Nid Storage |
1830 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
30 |
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.
Lake Lashane Dam