Green Lake Dam Reservoir Report

Last Updated: December 5, 2025

Green Lake Dam, located in Pulaski County, Arkansas, was completed in 1972 and is owned privately.


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Summary

The dam, designed by USDA NRCS, stands at a height of 25 feet and serves primarily for recreation purposes. It has a normal storage capacity of 24.2 acre-feet and covers a surface area of 2 acres. The dam regulates McHenry Creek-OS and has a high hazard potential with a moderate risk assessment rating of 3.

Despite being a privately owned structure, Green Lake Dam falls under state jurisdiction and is regulated by the Arkansas Natural Resources Commission. It is subject to state permitting, inspection, and enforcement, ensuring that the dam meets safety standards and poses no risk to the surrounding environment or communities. The dam's spillway type is uncontrolled, with a maximum discharge capacity of 289 cubic feet per second.

Green Lake Dam, situated in Little Rock, Arkansas, is a significant landmark for water resource and climate enthusiasts. Its presence in the Vicksburg District adds to the area's recreational opportunities and water management infrastructure. With a history dating back to the early 1970s, the dam continues to be a focal point for both locals and visitors, offering a serene backdrop for outdoor activities and a vital resource for the surrounding ecosystem.

Year Completed

1972

Dam Length

373

Dam Height

25

River Or Stream

MC HENRY CREEK-OS

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

22

Drainage Area

0.04

Nid Storage

75

Structural Height

25

Hazard Potential

High

Nid Height

25
       
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.