Lost Lake Reservoir Report

Last Updated: December 4, 2025

Lost Lake is a high-altitude lake located in the Uinta Mountains of Utah.


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Summary

The lake is primarily fed by snowpack, which melts in the spring and summer months. Lost Lake is part of the Provo River watershed and provides water to the Provo River, which is a vital source of irrigation water for agricultural use in the region. The lake also supports recreational activities, such as fishing and camping. Lost Lake is part of the High Uintas Wilderness Area and has a rich history, with evidence of human habitation dating back over 10,000 years. The lake was named by early settlers in the area who believed it was a "lost" lake due to its hidden location. Despite its remote location, the lake is popular among outdoor enthusiasts and provides important ecosystem services to the surrounding area.

Reservoir Details

Storage 24hr Change 0.1%
Percent of Normal 111%
Minimum 1.4 acre-ft
2010-10-02
Maximum 1,245.2 acre-ft
2008-05-21
Average 511 acre-ft
Nid_Height 45
Primary_Dam_Type Earth
Drainage_Area 3
Year_Completed 1931
Structural_Height 45
River_Or_Stream LOST CREEK, UPPER PROVO RIVER
Hazard_Potential High
Nid_Storage 1660
Dam_Length 930
       
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.