Posy Lake Reservoir Report

Last Updated: December 5, 2025

Posy Lake, located in Garfield, Utah, is a picturesque water resource managed by the USDA Forest Service for recreational purposes.


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Summary

The lake is a small earth dam structure with a height of 15 feet and a maximum storage capacity of 50 acre-feet. With a surface area of 11 acres, Posy Lake offers visitors a tranquil escape surrounded by the natural beauty of the forest.

Despite its modest size, Posy Lake is regulated by the Utah Division of Water Rights, ensuring that it meets state standards for safety and environmental impact. The dam's low hazard potential and moderate risk assessment make it a relatively safe destination for outdoor enthusiasts looking to enjoy water-based activities in a serene setting. Visitors can appreciate the uncontrolled spillway and surrounding landscape, knowing that the Forest Service conducts regular inspections to maintain the lake's condition and ensure its continued accessibility.

For water resource and climate enthusiasts, Posy Lake provides a unique opportunity to explore a federally managed water source in the heart of Utah. With its easy access and well-maintained facilities, this hidden gem offers a peaceful retreat where visitors can appreciate the intersection of human intervention and natural beauty. Whether fishing, boating, or simply soaking in the scenic views, Posy Lake is a must-visit destination for those seeking a harmonious blend of recreation and conservation in the great outdoors.

Dam Length

120

Dam Height

15

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

6

Nid Storage

50

Structural Height

7

Outlet Gates

Uncontrolled

Hazard Potential

Low

Nid Height

15
       
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.