Bentley Reservoir Report

Last Updated: December 14, 2025

Bentley is a private earth dam located in Natrona, Wyoming, specifically in the Big Muddy Oil Field area.


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Summary

Completed in 1960, this irrigation dam stands at a height of 26 feet and has a storage capacity of 104 acre-feet. With a surface area of 8 acres and a drainage area of 0, Bentley primarily serves the purpose of irrigation, utilizing a stone core type and soil foundation to support its structure.

Despite being classified as having a low hazard potential and fair condition assessment, Bentley is subject to state regulation, permitting, inspection, and enforcement by the Wyoming State Engineer's Office. The dam features an uncontrolled spillway with a width of 30 feet and one slide gate for outlet control. Its last inspection in June 2020 deemed it in satisfactory condition, with a moderate risk assessment rating of 3.

Located along Claud Creek, Bentley plays a crucial role in water resource management in the area, ensuring the availability of water for agricultural purposes. With its strategic positioning and operational efficiency, Bentley stands as a vital infrastructure for the local community, contributing to the sustainable utilization of water resources in Wyoming. For water resource and climate enthusiasts, Bentley serves as a fascinating example of human-engineered infrastructure working in harmony with the natural environment to support vital irrigation needs.

Year Completed

1960

Dam Length

700

Dam Height

26

River Or Stream

CLAUD CREEK

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

20

Nid Storage

104

Structural Height

26

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
Seasonal Comparison

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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.