Moon Lake Reservoir Reservoir Report

Last Updated: December 4, 2025

Moon Lake Reservoir is a man-made lake located in the Ashley National Forest in northeastern Utah.


°F

°F

mph

Wind

%

Humidity

Summary

The reservoir was constructed in the early 1900s to store water for agricultural purposes in the Uinta Basin. The water in the reservoir comes from snowmelt and surface runoff from surrounding mountains. The reservoir is also fed by the White River and tributaries. The water is used for irrigation in the surrounding agricultural areas and for recreational purposes such as fishing, camping, and boating. The reservoir has a capacity of over 76,000 acre-feet and covers an area of 2,800 acres. The surrounding area is popular for outdoor activities, including hiking, hunting, and snowmobiling in the winter. Moon Lake Reservoir is an important source of water for the region and provides significant benefits to the local communities.

Reservoir Details

Storage 24hr Change 0.59%
Percent of Normal 66%
Minimum 728.0 acre-ft
2007-09-16
Maximum 38,772.0 acre-ft
2017-06-22
Average 17,372 acre-ft
       
Seasonal Comparison
Storage Levels
Storage Levels
Pool Elevation Levels
Total Release Levels
Inflow Levels

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.