Nat Branch Reservoir Report
Nearby: Howley Creek #5 Howley Creek #6
Last Updated: December 13, 2025
Nat Branch is a state-regulated dam located in Carroll, Tennessee, with a structural height of 37.5 feet and a length of 810 feet.
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Summary
Completed in 1990, this earth dam serves multiple purposes, including flood control and water storage, with a normal storage capacity of 540 acre-feet and a maximum storage of 960 acre-feet. The dam's spillway type is classified as uncontrolled, with a surface area of 62 acres and a drainage area of 1.4 square miles.
Managed by the Tennessee Safe Dams Program, Nat Branch has a low hazard potential and is rated as having a satisfactory condition as of the last assessment in September 2017. The dam is inspected every three years to ensure its safety and functionality, with the last inspection conducted in 2017. Despite its moderate risk assessment level, the dam's risk management measures and emergency preparedness details are not explicitly outlined. Overall, Nat Branch serves as a vital infrastructure for water resource management in the region, highlighting the importance of maintaining and monitoring such critical structures in the face of changing climate conditions.
Year Completed |
1990 |
Dam Length |
810 |
River Or Stream |
NAT BRANCH |
Primary Dam Type |
Earth |
Surface Area |
62 |
Drainage Area |
1.4 |
Nid Storage |
960 |
Structural Height |
37.5 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
38 |
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.
Nat Branch