Clear Lk A Lakeport Ca Reservoir Report

Last Updated: December 5, 2025

Clear Lake is a natural freshwater lake situated in Lake County, California.


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Summary

It is the largest natural lake in the state, covering an area of 68 square miles. The lake has a rich history and was known as "Lypoyomi" by the Pomo Native Americans who lived in the area. The hydrology of the lake is unique, with no visible outflow and a high level of evaporation. The surface flow of the lake is provided by Cache Creek, while the snowpack from surrounding mountains contributes to its water level. The lake is also used for agricultural purposes, with vineyards and orchards surrounding its shores. Recreation activities on the lake include fishing, boating, and water sports. However, in recent years, the lake has been affected by toxic algae blooms, which have impacted its recreational and agricultural uses.

Reservoir Details

Gage Height, Ft 24hr Change 0.0%
Percent of Normal 152%
Minimum 0.01 ft
2014-08-28
Maximum 10.59 ft
2017-02-23
Average 2 ft
       
Seasonal Comparison
Gage Height, 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.