Hape Reservoir Report

Last Updated: December 5, 2025

Hape, located in Sheridan, Wyoming, is a privately owned earth dam completed in 1970 with a primary purpose of fire protection, stock, or small fish pond.


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Summary

This structure on Hape Draw, designed by Walter Pilch, stands at 35 feet high with a hydraulic height of 30 feet and a length of 220 feet. The dam has a storage capacity of 43 acre-feet and a surface area of 3 acres, serving as a crucial asset for flood risk reduction in the area.

Despite its low hazard potential, Hape's condition assessment is rated as poor, with its last inspection in May 2021 revealing areas in need of improvement. The dam has an uncontrolled spillway and one outlet gate, with moderate risk assessment indicating a need for proactive risk management measures. With its location in a climate-sensitive region and the potential for increased extreme weather events, ensuring the proper maintenance and monitoring of Hape is essential for water resource and climate enthusiasts looking to protect the surrounding area from potential hazards.

Year Completed

1970

Dam Length

220

Dam Height

35

River Or Stream

HAPE DRAW

Primary Dam Type

Earth

Surface Area

3

Hydraulic Height

30

Nid Storage

43

Structural Height

35

Outlet Gates

Uncontrolled - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

35
       
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.