Hermine Reservoir Report

Last Updated: December 23, 2025

Hermine, located in Casper, Wyoming, on Bates Creek, is a privately owned irrigation dam completed in 1912.


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Summary

With a height of 12 feet and a storage capacity of 174 acre-feet, Hermine plays a crucial role in water management for the surrounding area. The dam is regulated and inspected by the Wyoming State Engineer's Office, ensuring its safety and compliance with state regulations.

Despite being classified as having low hazard potential and being in fair condition as of the last assessment in April 2017, Hermine is subject to regular inspections every five years to monitor its structural integrity and functionality. The dam serves primarily for irrigation purposes, highlighting its importance in supporting agricultural activities in Natrona County. Its location within the Sacramento District and under the jurisdiction of state regulatory agencies underscores its significance in water resource management in the region.

With Liz Cheney (R) as the Congressional representative for the area, Hermine stands as a historical landmark that continues to contribute to the local water infrastructure. Its construction over a century ago reflects a commitment to harnessing natural resources for societal benefit, emphasizing the enduring role of dams in sustaining water supply and agricultural production. As water resource and climate enthusiasts, understanding the role and management of structures like Hermine is essential for ensuring the resilience and sustainability of water systems in the face of changing environmental conditions.

Year Completed

1912

Dam Height

12

River Or Stream

BATES CREEK

Primary Dam Type

Earth

Hydraulic Height

10

Nid Storage

174

Structural Height

12

Hazard Potential

Low

Nid Height

12
       
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.