Lost Lake Dike Reservoir Report

Last Updated: December 4, 2025

Lost Lake Dike, located in Wasatch, Utah, is a Federal-owned earth dam on the Upper Provo River, managed by the Bureau of Reclamation since its completion in 1931.


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Summary

Standing at a height of 23 feet, it serves as a vital water resource structure with a storage capacity of 1350 acre-feet. Despite its low hazard potential, the dam has not undergone recent condition assessments, making its current state unknown.

With no state jurisdiction or regulation, Lost Lake Dike is primarily overseen by the Bureau of Reclamation for operations, inspections, and regulatory purposes. The dam's Emergency Action Plan (EAP) status and risk assessment details are not readily available, raising concerns about emergency preparedness and management in case of potential hazards. Although the dam has a history of low risk, the lack of recent assessments and inspection updates underscores the importance of ongoing monitoring and maintenance to ensure its continued safety and functionality for water resource and climate enthusiasts in the area.

Year Completed

1931

Dam Height

23

River Or Stream

UPPER PROVO RIVER

Primary Dam Type

Earth

Nid Storage

1350

Structural Height

23

Hazard Potential

Low

Nid Height

23
       
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.