Lahontan Reservoir Nr Fallon Reservoir Report

Last Updated: December 13, 2025

Lahontan Reservoir is a man-made lake located in Nevada, near the town of Fallon.


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Summary

The reservoir was created in 1905 as part of an irrigation project aimed at providing water to the surrounding agricultural land. The lake is fed by the Carson and Truckee Rivers and its size can vary depending on the snowpack levels in the surrounding mountains. The reservoir provides water for irrigation, recreation, and serves as a habitat for fish and wildlife. The Lahontan Reservoir is a popular destination for boating, fishing, and camping. The surface flow from the Carson and Truckee rivers is critical to the reservoir's water levels, and the snowpack in the surrounding mountains plays a significant role in determining the amount of water available for use.

Reservoir Details

Lake Or Reservoir Water Surface Elevation Above Navd 1988, Ft 24hr Change None%
Percent of Normal None%
Minimum 4,151.64 ft
2020-03-26
Maximum 4,152.21 ft
2020-04-15
Average ft
Dam_Height 120
Hydraulic_Height 115
Drainage_Area 1903
Years_Modified 1985 - Structural
Year_Completed 1915
Nid_Storage 422800
Structural_Height 140
Foundations Rock, Soil
Surface_Area 15000
Outlet_Gates Needle - 1, Other Controlled - 2, Valve - 2
River_Or_Stream CARSON RIVER
Dam_Length 1915
Hazard_Potential High
Primary_Dam_Type Earth
Nid_Height 140
       
Seasonal Comparison
Reservoir Storage, Acre-Ft Levels
Elevation Of Reservoir Water Surface Above Datum, Ft Levels
Lake Or Reservoir Water Surface Elevation Above Navd 1988, Ft 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.