Casper Sage Creek Reservoir Report

Last Updated: December 14, 2025

Casper Sage Creek, also known as City Reservoir, is a significant water resource in Natrona, Wyoming, owned and regulated by the local government.


°F

°F

mph

Wind

%

Humidity

Summary

Built in 1952, this Earth-type dam on Sage Creek serves primarily for irrigation purposes, with a storage capacity of 165 acre-feet and a surface area of 11 acres. The dam stands at a height of 40 feet, with a spillway width of 45 feet to manage maximum discharge levels.

Maintaining a fair condition assessment, with a significant hazard potential, Casper Sage Creek underwent its last inspection in April 2017. The dam features a single vertical lift outlet gate and operates under uncontrolled spillway conditions. With a moderate risk rating, the dam is located in a picturesque setting, with Liz Cheney as the congressional representative for the area. Water and climate enthusiasts can appreciate the engineering and management challenges involved in sustaining this vital water resource.

As a focal point for water management in the area, Casper Sage Creek requires regular inspection and maintenance to ensure its continued function and safety. With its location in a scenic natural setting and the critical role it plays in irrigation, this dam on Sage Creek serves as a reminder of the importance of sustainable water resource management in the face of changing climate conditions.

Year Completed

1952

Dam Length

800

Dam Height

40

River Or Stream

SAGE CREEK

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

35

Drainage Area

1.2

Nid Storage

165

Structural Height

40

Outlet Gates

Vertical Lift - 1

Hazard Potential

Significant

Foundations

Soil

Nid Height

40
       
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.