Stonebridge Reservoir Report

Last Updated: December 5, 2025

Stonebridge, located in Wapatia, Wyoming, is a privately owned irrigation dam constructed in 1905 by designer Roy R.


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Summary

Holm. This earth dam, with a height of 24 feet and a length of 685 feet, serves the primary purpose of irrigation along the Whit Creek offstream. Stonebridge has a storage capacity of 822 acre-feet, with a surface area of 63 acres and a drainage area of 1 square mile.

Despite being regulated by the State of Wyoming, Stonebridge is classified as having a significant hazard potential with a fair condition assessment. The dam features an uncontrolled spillway with a width of 50 feet and is equipped with valve gates for outlet control. The last inspection in July 2017 revealed a moderate risk level (3) and an inspection frequency of every 5 years. Stonebridge remains an essential structure for water resource management in the region, providing crucial irrigation support for agricultural activities.

As a key component of the local water infrastructure, Stonebridge plays a crucial role in ensuring water availability for the surrounding area. With its historical significance and ongoing importance for irrigation purposes, the dam represents a blend of engineering ingenuity and environmental stewardship. Climate enthusiasts and water resource experts alike can appreciate the intricate balance of water management and conservation efforts embodied by Stonebridge in Park County, Wyoming.

Year Completed

1905

Dam Length

685

Dam Height

24

River Or Stream

WHIT CREEK OFFSTREAM

Primary Dam Type

Earth

Surface Area

63

Hydraulic Height

19

Drainage Area

1

Nid Storage

822

Structural Height

24

Outlet Gates

Valve - 0

Hazard Potential

Significant

Foundations

Soil

Nid Height

24
       
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.