Simmons Reservoir Report
Nearby: Simmons #2 Dettwiller
Last Updated: December 10, 2025
Simmons, a private dam located in Humphreys, Tennessee, was completed in 1971 and stands at a height of 31 feet with a hydraulic height of 28.6 feet.
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Summary
It holds a maximum storage capacity of 193 acre-feet and covers a surface area of 13.8 acres, with a drainage area of 0.24 square miles. The dam, primarily constructed of earth, spans 650 feet and features an uncontrolled spillway. Despite its significant hazard potential, its condition assessment remains unrated as of the last inspection in January 2016.
The dam on Culvert Branch, under the jurisdiction of the Nashville District, does not have any associated structures or federal agency involvement in its ownership, funding, design, construction, regulation, inspection, or operation. It is not regulated by the state and does not require permitting or enforcement. The risk assessment for Simmons is moderate, with a rating of 3, and it currently does not have an Emergency Action Plan (EAP) in place or meet the guidelines for one. With its historical significance and potential impacts on water resources in the area, Simmons serves as an important structure for water resource and climate enthusiasts to monitor and study.
Year Completed |
1971 |
Dam Length |
650 |
River Or Stream |
CULVERT BRANCH |
Primary Dam Type |
Earth |
Surface Area |
13.8 |
Hydraulic Height |
28.6 |
Drainage Area |
0.24 |
Nid Storage |
193 |
Structural Height |
31 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Piney River At Vernon
|
99cfs |
Duck River Above Hurricane Mills
|
2450cfs |
Yellow Creek At Ellis Mills
|
39cfs |
Duck River At Hwy 100 At Centerville
|
1900cfs |
Buffalo River Below Lobelville
|
552cfs |
Harpeth River Near Kingston Springs
|
425cfs |
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.
Simmons