Mcnairycypress Creek #9 Reservoir Report
Last Updated: December 5, 2025
Mcnairy-Cypress Creek #9, also known as Mcnairy Cypress Creek W/S Dam 15, is a local government-owned earth dam located in Bethel Springs, Tennessee.
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Summary
This dam, designed by the USDA NRCS and Dan McGill of Owem Ayres Associates, serves the primary purpose of flood risk reduction along the Cypress Creek. Completed in 1985, the dam has a structural height of 30 feet and a length of 1325 feet, with a storage capacity of 6119 acre-feet and a drainage area of 9.14 square miles.
Managed by the Tennessee Safe Dams Program, Mcnairy-Cypress Creek #9 has a high hazard potential but is currently in satisfactory condition. The dam's spillway type is uncontrolled, with no outlet gates, and it has a moderate risk assessment rating. Despite its high hazard potential, the dam is regularly inspected by state regulators, with the last assessment conducted in April 2020. With a focus on flood risk reduction, this dam plays a crucial role in protecting the surrounding area from potential flooding events.
Located within the Nashville District and under the jurisdiction of the Tennessee state regulatory agency, Mcnairy-Cypress Creek #9 is an essential structure for water resource management in the region. With its significant storage capacity and strategic location along the Cypress Creek, this dam serves as a vital defense against potential flood risks, highlighting the importance of effective dam infrastructure in mitigating climate-related challenges.
Year Completed |
1985 |
Dam Length |
1325 |
River Or Stream |
CYPRESS CREEK |
Primary Dam Type |
Earth |
Surface Area |
158.9 |
Drainage Area |
9.14 |
Nid Storage |
6119 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Horse Creek Near Savannah
|
87cfs |
Hatchie River At Bolivar
|
944cfs |
Hatchie River Near Walnut
|
153cfs |
Middle Fork Forked Deer River Near Fairview
|
166cfs |
Wolf River At Lagrange
|
227cfs |
Buffalo River Near Flat Woods
|
443cfs |
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.
Mcnairycypress Creek #9