Boulter Reservoir Report

Last Updated: December 5, 2025

Boulter is a privately owned earth dam located in Sublette, Wyoming, along Boulter Creek.


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Summary

Completed in 1956, this irrigation dam serves multiple purposes including fire protection, stock, small fish pond, and irrigation. With a height of 21 feet and a storage capacity of 766 acre-feet, Boulter Dam plays a crucial role in water resource management in the area.

Despite being classified as having a low hazard potential and fair condition assessment, Boulter Dam is subject to regular inspections by state regulatory agencies to ensure its safety and compliance with standards. The dam features an uncontrolled spillway and a single valve outlet gate for water release. Its risk assessment is rated as moderate, indicating the need for ongoing monitoring and risk management measures to safeguard against potential hazards.

Situated in a scenic location with a surface area of 42 acres and a drainage area of 2.5 square miles, Boulter Dam is not only a functional structure for water storage and distribution but also a part of the local landscape. With its strategic position and historical significance, Boulter Dam represents a vital piece of infrastructure for water resource and climate enthusiasts interested in the intersection of human engineering with natural ecosystems.

Year Completed

1956

Dam Length

95

Dam Height

21

River Or Stream

BOULTER CREEK

Primary Dam Type

Earth

Surface Area

42

Hydraulic Height

16

Drainage Area

2.5

Nid Storage

766

Structural Height

21

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

21
       
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.