St. Marys Lime Sludge Lagoons Reservoir Report
Last Updated: December 20, 2025
Located in St.
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Summary
Marys, Ohio, the Lime Sludge Lagoons serve as a crucial water resource management facility, designed by Floyd Browne Associates, Inc. The lagoons are regulated by the Department of Natural Resources and feature a significant dam height of 13 feet, completed in 1988. With a primary purpose of tailings storage, the lagoons have a storage capacity of 128 acre-feet and cover a surface area of 12 acres, catering to a drainage area of 0.03 square miles.
The St. Marys Lime Sludge Lagoons boast a fair condition assessment, with a significant hazard potential. The site has been inspected regularly, with the last inspection conducted in October 2019. Despite its fair condition, the lagoons meet regulatory standards and are equipped to handle a maximum discharge of 10 cubic feet per second. The facility's Emergency Action Plan (EAP) was last updated in July 2020, ensuring preparedness for any potential risks or emergencies.
This water management infrastructure, situated within Auglaize County, Ohio, plays a vital role in tailings storage and overall water resource management. With its strategic location along the KOOP stream and state regulatory compliance, the St. Marys Lime Sludge Lagoons serve as a key asset in maintaining water quality and ensuring efficient water resource utilization in the region.
Year Completed |
1988 |
Dam Length |
2640 |
Dam Height |
13 |
River Or Stream |
KOOP |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
0.03 |
Nid Storage |
128 |
Hazard Potential |
Significant |
Nid Height |
13 |
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.
St. Marys Lime Sludge Lagoons