Gwinnett Co. Rc And D Tm1 Reservoir Report

Last Updated: December 5, 2025

Gwinnett Co.


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Summary

Rc and D Tm1, also known as Tribble Mill No. 1, is a local government-owned recreational dam located in Gwinnett County, Georgia. Completed in 1990, this earth dam stands at a height of 35 feet and spans a length of 815 feet, creating a storage capacity of 2,414 acre-feet and a surface area of 108 acres. With a drainage area of 9.2 square miles, the dam has a maximum discharge capacity of 10,200 cubic feet per second.

Managed by the USDA NRCS, Gwinnett Co. Rc and D Tm1 serves primarily for recreational purposes, offering opportunities for outdoor activities such as fishing, boating, and hiking. Despite being classified as having a high hazard potential, the dam's condition assessment is currently unavailable, with the last inspection conducted in July 2015. With a moderate risk rating of 3, the dam is monitored for any necessary risk management measures to ensure public safety and the preservation of the surrounding environment.

Water resource and climate enthusiasts can appreciate the significance of Gwinnett Co. Rc and D Tm1 as a vital infrastructure for recreational enjoyment and water storage in the region. Its construction and operation by the NRCS demonstrate the commitment to sustainable land and water management practices, contributing to the overall ecological health and water resource resilience in Gwinnett County, Georgia. As efforts continue to monitor and maintain the dam's safety, it remains a valuable asset for both the local community and the natural environment.

Year Completed

1990

Dam Length

815

Dam Height

35

Primary Dam Type

Earth

Surface Area

108

Drainage Area

9.2

Nid Storage

2414

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

35
       
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.