Angel Park South Detention Basin Dam Reservoir Report

Last Updated: December 5, 2025

Angel Park South Detention Basin Dam, also known as Angel Park Detention Basin Phase Iia, is a crucial water management structure located in Las Vegas, Nevada.


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Summary

Built in 1982 by the local government, this earth dam serves the primary purpose of flood risk reduction along the Las Vegas Wash-TR. With a height of 30 feet and a length of 2934 feet, this dam has a storage capacity of 600 acre-feet and covers a surface area of 23.7 acres.

The dam boasts an uncontrolled spillway with a width of 730 feet and a maximum discharge capacity of 17,600 cubic feet per second, making it an essential tool in managing water flow during heavy rainfall events. Despite its high hazard potential, the dam's condition assessment in 2021 deemed it to be in fair condition, with a moderate risk level. Regular inspections and maintenance ensure its continued functionality and effectiveness in mitigating flood risks in the region.

Angel Park South Detention Basin Dam plays a pivotal role in the water resource management infrastructure of Clark County, Nevada. It stands as a testament to the importance of strategic flood risk reduction measures in the face of fluctuating climate conditions. As a key component of the local water management system, this dam serves as a critical asset in safeguarding the community against potential flooding events, highlighting the intersection of water resources and climate resilience in the region.

Years Modified

1985 - Structural, 1992 - Hydraulic

Year Completed

1982

Dam Length

2934

Dam Height

13

River Or Stream

LAS VEGAS WASH-TR

Primary Dam Type

Earth

Surface Area

23.7

Hydraulic Height

9

Drainage Area

6.4

Nid Storage

600

Structural Height

30

Outlet Gates

Uncontrolled - 1

Hazard Potential

High

Foundations

Soil

Nid Height

30
       
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.