Grand Bayou Reservoir Reservoir Report

Last Updated: January 11, 2026

Grand Bayou Reservoir, also known as John K.


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Summary

Kelly Grand Bayou Reservoir, is a state-owned water resource located in Red River, Louisiana. Completed in 1994, this reservoir serves primarily for recreational purposes, but also plays a role in water supply. Spanning over 2,700 acres with a drainage area of 134 square miles, the reservoir has a maximum storage capacity of 66,000 acre-feet and a normal storage capacity of 27,000 acre-feet.

With a dam height of 30 feet and a hydraulic height of 44 feet, Grand Bayou Reservoir has a spillway width of 350 feet and a hazard potential rated as high due to its design and condition assessment. Despite being classified as fair in condition, the reservoir undergoes regular inspections by state regulators to ensure its safe operation. The reservoir's location on Grand Bayou provides a picturesque setting for outdoor enthusiasts and water resource aficionados alike to enjoy boating, fishing, and other recreational activities in the heart of Louisiana.

Year Completed

1994

Dam Length

5800

Dam Height

30

River Or Stream

GRAND BAYOU

Primary Dam Type

Earth

Surface Area

2700

Hydraulic Height

30

Drainage Area

134

Nid Storage

66000

Structural Height

44

Outlet Gates

Slide (sluice gate)

Hazard Potential

High

Foundations

Soil

Nid Height

44
       
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.