Hills Mill Reservoir Report
Last Updated: December 10, 2025
Hills Mill, located in Robertson County, Tennessee, along the Sulphur Fork River, is a concrete dam with a primary purpose of "Other." Built in 1903, the dam stands at a hydraulic height of 15.3 feet and a structural height of 19.3 feet.
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Summary
With a storage capacity of 663 acre-feet, the dam serves to regulate water flow and provide flood control in the region. Despite being privately owned and not regulated by the state, Hills Mill has a low hazard potential and a moderate risk assessment rating.
The dam, with a length of 133 feet and a surface area of 55 acres, plays a crucial role in managing the water resources of the area. While the dam itself is not equipped with outlet gates or spillways, it has been deemed to meet safety guidelines and poses a low risk to surrounding communities. The last inspection in March 2016 confirmed the overall good condition of the structure, although it remains unrated in terms of its current state assessment.
Overall, Hills Mill serves as a vital component of the water infrastructure in Robertson County, contributing to water storage and management efforts along the Sulphur Fork River. With its historical significance and moderate risk profile, the dam continues to play a key role in the local water resource and climate management landscape.
Year Completed |
1903 |
Dam Length |
133 |
River Or Stream |
SULPHUR FORK |
Primary Dam Type |
Concrete |
Surface Area |
55 |
Hydraulic Height |
15.3 |
Drainage Area |
215 |
Nid Storage |
663 |
Structural Height |
19.3 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
19 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Red River At Port Royal
|
237cfs |
Sycamore Creek Near Ashland City
|
30cfs |
Whites Creek Near Bordeaux
|
16cfs |
Dry Creek Near Edenwold
|
2cfs |
Harpeth River Near Kingston Springs
|
494cfs |
Yellow Creek At Ellis Mills
|
43cfs |
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.
Hills Mill