B Lake #1 Reservoir Report

Last Updated: December 24, 2025

B Lake #1 is a private earth dam located in Grundy, Tennessee, built in 1960 on TRIBBLACK CREEK.


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Summary

With a structural height of 15 feet and a storage capacity of 69 acre-feet, this dam serves as a vital water resource for the surrounding area. The dam's purpose and associated structures are not specified, but it is classified as having a significant hazard potential and a moderate risk assessment rating.

Despite being privately owned and not regulated by the state, B Lake #1 poses a moderate risk due to its condition assessment being marked as "Not Rated." The dam's emergency action plan status is unspecified, and it has not been inspected since May 2016, with a scheduled inspection frequency of every 5 years. The spillway type is listed as "Uncontrolled," with no outlet gates specified, indicating potential challenges in managing water flow during high-volume events.

Water resource and climate enthusiasts interested in B Lake #1 should note its location in a high-risk area and the potential implications of its current condition assessment. With no state jurisdiction or permitting, the responsibility for monitoring and maintaining this dam falls solely on its private owner. The lack of recent inspections and updates to emergency action plans may pose concerns for the structural integrity and safety of the dam in the face of varying weather conditions and potential emergencies.

Year Completed

1960

River Or Stream

TRIBBLACK CREEK

Primary Dam Type

Earth

Surface Area

11.5

Drainage Area

0.59

Nid Storage

69

Structural Height

15

Outlet Gates

None

Hazard Potential

Significant

Nid Height

15
       
Seasonal Comparison

Weather Forecast

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.