Lake Jo-Ann Reservoir Report
Nearby: Timber Lake Trax Farms
Last Updated: December 13, 2025
Lake Jo-Ann, located in Peters Township, Pennsylvania, is a private recreational lake regulated by the Pennsylvania Department of Environmental Protection.
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Summary
Built in 1950, this Earth dam stands at a height of 16 feet and has a length of 515 feet, providing a storage capacity of 187 acre-feet and a surface area of 14 acres. The dam is primarily used for recreation purposes, offering opportunities for boating, fishing, and other outdoor activities.
With a drainage area of 1.62 square miles, Lake Jo-Ann has a high hazard potential but is currently in satisfactory condition, according to the most recent inspection in November 2020. The dam underwent structural modifications in 2007 to ensure its safety and functionality. Despite its high hazard potential, the dam's emergency action plan status, risk assessment, and inundation maps are currently unlisted, suggesting the need for further evaluation and potential risk management measures.
Enthusiasts of water resources and climate will find Lake Jo-Ann to be an intriguing site for recreational activities, while also serving as a case study in dam management and safety. As a privately owned lake under state jurisdiction, it highlights the importance of regulatory oversight and maintenance to ensure the safety of both the structure and the surrounding community. Further research and monitoring may be necessary to assess and mitigate potential risks associated with this picturesque water resource.
Years Modified |
2007 - Structural |
Year Completed |
1950 |
Dam Length |
515 |
Dam Height |
16 |
River Or Stream |
TR PETERS CREEK |
Primary Dam Type |
Earth |
Surface Area |
14 |
Drainage Area |
1.62 |
Nid Storage |
187 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Monongahela River At Elizabeth
|
21100cfs |
Chartiers Creek At Carnegie
|
105cfs |
Youghiogheny River At Sutersville
|
1030cfs |
Little Pine Creek Near Etna
|
2cfs |
Ohio River At Sewickley
|
10300cfs |
South Fork Tenmile Creek At Jefferson
|
50cfs |
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 Jo-Ann
Canonsburg Lake