Johnson Reservoir Report
Nearby: Too Lazy To Farm Camp Haiyaka Lake
Last Updated: December 13, 2025
Johnson is a private dam located in Shelby, Tennessee, along the Big Creek Drainage Canal.
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Summary
Built in 1950 for recreational purposes, this Earth-type dam stands at a height of 10.6 feet, with a hydraulic height of 9.2 feet. It has a storage capacity of 48 acre-feet and covers a surface area of 9.2 acres, serving as a popular spot for outdoor activities.
Despite being privately owned, Johnson has not been regulated or inspected by the state. With a significant hazard potential and a moderate risk assessment rating, this dam poses some safety concerns that need to be addressed. While it has not been condition rated, regular inspections are recommended to ensure the structural integrity of the dam and the safety of surrounding areas.
Although Johnson does not have a designated Emergency Action Plan (EAP) or updated contact information for emergencies, it remains a key recreational site in the region. As climate change continues to impact water resources, it is essential for dam owners and authorities to prioritize maintenance and safety measures to mitigate potential risks and ensure the long-term sustainability of this valuable resource.
Year Completed |
1950 |
Dam Length |
415 |
River Or Stream |
BIG CREEK DRAINAGE CANAL |
Primary Dam Type |
Earth |
Surface Area |
9.2 |
Hydraulic Height |
9.2 |
Drainage Area |
0.1 |
Nid Storage |
48 |
Structural Height |
10.6 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Nid Height |
11 |
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.
Johnson