Angle Detention Dam Reservoir Report

Last Updated: December 5, 2025

Angle Detention Dam, located in Park County, Wyoming, is a Federal-owned structure managed by the Bureau of Land Management that serves the primary purpose of debris control.


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Summary

This gravity dam, standing at a structural height of 30 feet with a hydraulic height of 26 feet, was built to safeguard against potential hazards with its low hazard potential rating. Despite its poor condition assessment, the dam's risk assessment remains moderate, suggesting a need for ongoing monitoring and maintenance.

With a maximum storage capacity of 327.24 acre-feet and a normal storage capacity of 477.9 acre-feet, Angle Detention Dam plays a crucial role in water resource management in the area. The dam's uncontrolled spillway and moderate risk level highlight the importance of regular inspections and potential risk management measures to ensure the safety and efficiency of the structure. Despite its limited information on completion year and structural details, the dam's strategic location and purpose make it a key component in the region's water infrastructure.

For water resource and climate enthusiasts, Angle Detention Dam represents a significant piece of infrastructure in Wyoming's landscape. As a Federal-owned gravity dam designed for debris control, it stands as a testament to the ongoing efforts to manage water resources and mitigate potential risks in the region. With its unique characteristics and moderate risk level, this dam serves as a reminder of the importance of maintaining and monitoring critical infrastructure in the face of changing climate conditions and evolving water management challenges.

Dam Length

1258

Primary Dam Type

Gravity

Surface Area

40.5

Hydraulic Height

26

Nid Storage

477.9

Structural Height

30

Hazard Potential

Low

Foundations

Unlisted/Unknown

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.