Mcnairycypress Creek #17 Reservoir Report
Nearby: Twin Springs Mcnairycypress Creek #16
Last Updated: December 5, 2025
Mcnairycypress Creek #17, also known as Mcnairy Cypress Creek W/S Dam 12, is a flood risk reduction structure located in McNairy, Tennessee.
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Summary
Built in 1979, this earth dam stands at a structural height of 34.1 feet and has a hydraulic height of 13.8 feet. With a NID storage capacity of 550 acre-feet and a normal storage capacity of 60 acre-feet, the dam serves the primary purpose of flood risk reduction along Wolf Branch.
Managed by the Tennessee Safe Dams Program, Mcnairycypress Creek #17 has a high hazard potential but is currently rated as satisfactory in terms of condition assessment, according to the last inspection conducted in May 2020. The dam has no outlet gates and features an uncontrolled spillway type. It is regulated, permitted, inspected, and enforced by state agencies, ensuring its compliance with safety standards and guidelines. The risk assessment for this structure is categorized as moderate (3), indicating a proactive approach to risk management measures.
This dam, designed by USDA NRCS & Hal Pridgeon, Jr of Prather.Thomas.Campbell.Pridgeon, is an essential infrastructure providing flood protection to the surrounding area. With its strategic location and effective design, Mcnairycypress Creek #17 remains a critical asset for water resource and climate management enthusiasts in the region, showcasing the collaborative efforts between local government and regulatory agencies to safeguard communities from potential flood hazards.
Year Completed |
1979 |
Dam Length |
960 |
River Or Stream |
WOLF BRANCH |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
13.8 |
Drainage Area |
0.97 |
Nid Storage |
550 |
Structural Height |
34.1 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Horse Creek Near Savannah
|
87cfs |
Hatchie River Near Walnut
|
153cfs |
Hatchie River At Bolivar
|
944cfs |
Wolf River At Lagrange
|
227cfs |
Bear Creek At Bishop
|
4330cfs |
Middle Fork Forked Deer River Near Fairview
|
166cfs |
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 #17