Alcova Reservoir Report

Last Updated: December 5, 2025

Alcova is a captivating hydroelectric and irrigation structure located in Natrona, Wyoming along the North Platte River.


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Summary

Completed in 1937, this Federal-owned earth dam stands at an impressive 265 feet in height and spans 763 feet in length. With a maximum storage capacity of 184,300 acre-feet and a surface area of 2,471 acres, Alcova plays a crucial role in water resource management and energy generation in the region.

Managed by the Bureau of Reclamation, Alcova is equipped with a controlled spillway and multiple outlet gates for efficient water release. Despite its high hazard potential and very high risk assessment, the dam is regularly inspected and regulated by the Bureau of Reclamation to ensure public safety and continuous operation. Strikingly situated in a picturesque location near Casper, Wyoming, Alcova serves as a testament to engineering excellence and the harmonious integration of water resources and climate considerations.

As a key component of the state's water infrastructure, Alcova showcases the importance of sustainable water management practices in the face of changing climate conditions. With its rich history, engineering significance, and vital role in providing hydroelectric power and irrigation water, Alcova stands as a symbol of resilience and innovation in the realm of water resource management and climate adaptation.

Year Completed

1937

Dam Length

763

Dam Height

265

River Or Stream

NORTH PLATTE RIVER

Primary Dam Type

Earth

Surface Area

2471

Hydraulic Height

185

Drainage Area

10376

Nid Storage

184405

Structural Height

265

Outlet Gates

Other Controlled - 3, Valve - 2

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

265
       
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.