Lake Las Vegas Dam Reservoir Report

Last Updated: December 5, 2025

Lake Las Vegas Dam, also known as Lake Adair, is a private dam located in Clark, Nevada, along the Las Vegas Wash.


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Summary

Completed in 1991, this earth dam stands at a height of 133 feet and serves primarily for recreational purposes, with a storage capacity of 10,600 acre-feet. The dam's spillway is of the controlled type, with a width of 300 feet, and it has a significant hazard potential with a fair condition assessment.

Designed by firms like KIMLEY-HORN and RBF CONSULTING, Lake Las Vegas Dam has a hydraulic height of 123 feet and a structural height of 165 feet. Although the dam is privately owned, it is regulated by the Nevada DWR, with state permitting, inspection, and enforcement in place. With a very high risk assessment rating and meeting guidelines, the dam's emergency action plan is regularly updated to ensure public safety in case of emergencies, making it a crucial infrastructure for water resource and climate enthusiasts to monitor and study in the region.

Years Modified

1997 - Other, 1998 - Hydraulic

Year Completed

1991

Dam Length

4208

Dam Height

133

River Or Stream

LAS VEGAS WASH

Primary Dam Type

Earth

Surface Area

320

Hydraulic Height

123

Drainage Area

140

Nid Storage

10600

Structural Height

165

Outlet Gates

Slide (sluice gate) - 1, Uncontrolled - 1

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

165
       
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.