Mccullough Hills Park Detention Basin Dam Reservoir Report

Last Updated: December 6, 2025

Mccullough Hills Park Detention Basin Dam, also known as Anthem Detention Basin I, is a vital structure owned and regulated by the local government of Henderson, Nevada.


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Summary

Completed in 2002, this earth dam serves as a crucial flood risk reduction measure along the Las Vegas Wash-TR river/stream. With a dam height of 41 feet and a hydraulic height of 32 feet, it stands at 47.8 feet tall and has a length of 1980 feet, providing a storage capacity of 393 acre-feet.

Despite its significant role in flood protection, the dam's condition assessment is marked as poor, with a high hazard potential. The last inspection in October 2021 highlighted the need for improvements to ensure the structure's safety and effectiveness. With a moderate risk rating, stakeholders must prioritize risk management measures to enhance the dam's resilience and mitigate potential threats. Additionally, the presence of an uncontrolled spillway and a single outlet gate underscores the importance of regular maintenance and monitoring to prevent any potential issues or failures. For water resource and climate enthusiasts, the Mccullough Hills Park Detention Basin Dam represents a critical infrastructure piece in Nevada's efforts to manage and mitigate flood risks in the region.

Year Completed

2002

Dam Length

1980

Dam Height

41

River Or Stream

LAS VEGAS WASH-TR

Primary Dam Type

Earth

Surface Area

20.9

Hydraulic Height

32

Drainage Area

7.5

Nid Storage

393

Structural Height

47.8

Outlet Gates

Uncontrolled - 1

Hazard Potential

High

Foundations

Soil

Nid Height

48
       
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.