Trail No. 1 Reservoir Report

Last Updated: December 5, 2025

Trail No.


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Summary

1 is a privately owned irrigation structure located in Guernsey, Wyoming, along Trail Creek. Constructed in 1955, this earth dam stands at 30 feet high and has a storage capacity of 145 acre-feet. Despite its low hazard potential, recent inspections have revealed poor structural conditions, indicating a need for maintenance and potential upgrades to ensure its continued functionality.

With a spillway width of 15 feet and a hydraulic height of 25 feet, Trail No. 1 serves as a crucial water resource for the surrounding area. However, its current condition assessment raises concerns about its long-term reliability. The dam's primary purpose is irrigation, supporting the agricultural needs of the region. Although the risk assessment categorizes it as moderate, the structure's deteriorating state underscores the importance of regular inspections and maintenance to mitigate potential hazards.

As a vital component of the local water infrastructure, Trail No. 1 requires ongoing attention to address its poor condition and ensure its continued effectiveness in water management. With its location in Congressional District 00 of Wyoming, under the jurisdiction of the State Regulatory Agency, the dam's state-permitted, inspected, and enforced status highlights the need for proactive measures to safeguard this essential resource for irrigation and environmental sustainability in the region.

Year Completed

1955

Dam Length

810

Dam Height

30

River Or Stream

TRAIL CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

25

Nid Storage

145

Structural Height

31

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

31
       
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.
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Area Campgrounds