Glendo Reservoir Report
Nearby: Glendo Dike No. 3 Glendo Dike No. 2
Last Updated: December 5, 2025
Glendo is a federal-owned dam located on the North Platte River in Wyoming, specifically in Casso, Platte County.
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Summary
This Earth dam, completed in 1958 by the Bureau of Reclamation, stands at a structural height of 190 feet and serves multiple purposes including flood risk reduction, fish and wildlife pond creation, hydroelectric power generation, irrigation, and recreation. With a hydraulic height of 145 feet and a storage capacity of over 1 million acre-feet, Glendo plays a crucial role in managing water resources in the region.
The dam has a controlled spillway with a width of 45 feet and a surface area of 23,320 acres. It is regulated by the Bureau of Reclamation and undergoes regular inspections and maintenance to ensure its structural integrity and operational efficiency. In 2016, the dam underwent structural modifications to enhance its performance. Despite its high hazard potential, Glendo is considered to have a very high risk assessment level, indicating the importance of effective risk management measures. Overall, Glendo is a key infrastructure for water resource management and climate resilience in Wyoming.
With its strategic location on the North Platte River and its significant storage capacity, Glendo Dam plays a vital role in flood risk reduction and water resource management in the region. Owned and operated by the Bureau of Reclamation, the dam not only serves practical purposes such as irrigation and hydroelectric power generation but also provides opportunities for recreation and wildlife conservation. As a critical piece of infrastructure, Glendo Dam is subject to regular inspections and maintenance to ensure its functionality and safety, highlighting its importance in maintaining water security and climate resilience in Wyoming.
Years Modified |
2016 - Structural |
Year Completed |
1958 |
Dam Length |
2096 |
River Or Stream |
NORTH PLATTE RIVER |
Primary Dam Type |
Earth |
Surface Area |
23320 |
Hydraulic Height |
145 |
Drainage Area |
19504 |
Nid Storage |
1118653 |
Structural Height |
190 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
190 |
Seasonal Comparison
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Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Glendo