Diamond Grove Reservoir Report

Last Updated: December 6, 2025

Diamond Grove is a state-regulated dam located in Madison, Tennessee, along the Tributary Fork of the Forked Deer River.


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Summary

Built in 1990, this earth dam stands at 22 feet high with a hydraulic height of 10 feet and a length of 990 feet. It has a normal storage capacity of 55 acre-feet and a total storage of 328 acre-feet, serving a drainage area of 0.43 square miles. The dam's spillway type is uncontrolled, and its hazard potential is rated as low, with a satisfactory condition assessment as of December 2020.

Managed by the Tennessee SAFE DAMS Program, Diamond Grove has undergone regular inspections, with the last one conducted in December 2020. The dam poses a moderate risk level (3) and has not had any associated emergency action plans prepared or updated. Despite the lack of outlet gates and locks, the dam has been deemed to meet regulatory guidelines and is equipped to handle its maximum storage capacity of 328 acre-feet. With its location in a picturesque area of Tennessee, Diamond Grove serves as a vital component of the region's water resource infrastructure, contributing to flood control and water supply management efforts.

Year Completed

1990

Dam Length

990

River Or Stream

TRIBNO. FORK FORKED DEER

Primary Dam Type

Earth

Surface Area

14.6

Hydraulic Height

10

Drainage Area

0.43

Nid Storage

328

Structural Height

22

Outlet Gates

None

Hazard Potential

Low

Nid Height

22
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.