Harold Mann Lake Dam Reservoir Report
Last Updated: December 17, 2025
Harold Mann Lake Dam, located in Posey County, Indiana, was completed in 1963 with the primary purpose of providing recreational opportunities.
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Summary
This earth dam stands at a height of 30 feet and stretches 875 feet in length, creating a storage capacity of 150 acre-feet. Despite its low hazard potential, the dam is currently in poor condition as of the last inspection in 2016, indicating a need for maintenance and improvements.
The dam, situated on an unnamed tributary of Neu Creek, is regulated by the Indiana Department of Natural Resources and undergoes regular inspections and enforcement measures. With a surface area of 8 acres and a drainage area of 0.2 square miles, the dam plays a crucial role in water resource management in the region. However, the lack of a spillway and outlet gates raises concerns about the dam's ability to manage high water events effectively.
Despite its high risk assessment rating, efforts to enhance the dam's safety and resilience, such as the development of emergency action plans and risk management measures, have yet to be implemented. Water resource and climate enthusiasts monitoring Harold Mann Lake Dam should advocate for proactive measures to address its poor condition and mitigate potential hazards to surrounding communities and ecosystems.
Year Completed |
1963 |
Dam Length |
875 |
Dam Height |
30 |
River Or Stream |
UNNAMED TRIBUTARY NEU CREEK |
Surface Area |
8 |
Drainage Area |
0.2 |
Nid Storage |
150 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Big Creek Near Wadesville
|
1cfs |
Wabash River At New Harmony
|
6160cfs |
Pigeon Creek Near Fort Branch
|
1cfs |
Wabash River At Mt. Carmel
|
6020cfs |
Patoka River Near Princeton
|
732cfs |
Little Wabash River At Carmi
|
73cfs |
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.
Harold Mann Lake Dam