Johns Creek Reservoir Report
Nearby: Moss Creek #3 Moss Creek #4
Last Updated: December 12, 2025
Johns Creek in Tennessee is a state-regulated dam with a low hazard potential and satisfactory condition assessment.
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Summary
Built in 1977, this earth dam stands at a structural height of 24 feet and a hydraulic height of 14 feet, providing a normal storage capacity of 83 acre-feet. Located in Carroll County, the dam impounds Johns Creek, serving as a crucial infrastructure for water resource management in the area.
Despite its moderate risk assessment, Johns Creek Dam is equipped with state-permitting, inspection, and enforcement mechanisms overseen by the Tennessee Safe Dams Program. With a drainage area of 0.31 square miles and a surface area of 18 acres, the dam plays a vital role in flood control and water supply management for the Whitthorne community. Its uncontrolled spillway type and lack of outlet gates suggest a reliance on natural drainage processes during high water events.
Although the dam has not been modified in recent years, regular inspections are conducted every three years to ensure its continued safe operation. With a capacity to store 255 acre-feet of water, Johns Creek Dam remains a significant feature in the local landscape, contributing to the overall water resource and climate resilience of the region.
Year Completed |
1977 |
Dam Length |
500 |
River Or Stream |
JOHNS CREEK |
Primary Dam Type |
Earth |
Surface Area |
18 |
Hydraulic Height |
14 |
Drainage Area |
0.31 |
Nid Storage |
255 |
Structural Height |
24 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
24 |
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.
Johns Creek