Clear Lake Reservoir Report
Nearby: Willow Valley Reservoir Big Johnson
Last Updated: December 6, 2025
Clear Lake, located in Modoc County, California, is a gravity dam constructed in 1910 by the Bureau of Reclamation for irrigation purposes.
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Summary
The dam stands at a height of 42 feet and has a storage capacity of 584,050 acre-feet, with a normal storage level of 374,080 acre-feet. The reservoir covers a surface area of 23,960 acres and is fed by the Lost River.
The dam at Clear Lake has a controlled spillway with a width of 357 feet, and the associated structure, CA10141S001, contributes to the efficient operation of the irrigation system. The risk assessment for Clear Lake rates it as having a high hazard potential and very high risk, emphasizing the importance of regular inspections and maintenance. The dam was last structurally modified in 2002, and its emergency action plan was last revised in 2016.
Managed by the Bureau of Reclamation, Clear Lake serves as a vital water resource for the region, showcasing the intricate engineering and design necessary for sustainable water management in the face of changing climate conditions. As climate enthusiasts and water resource advocates, the data on Clear Lake highlights the ongoing efforts to ensure the safety and reliability of water infrastructure while addressing the challenges posed by a dynamic environment.
Years Modified |
2002 - Structural |
Year Completed |
1910 |
Dam Length |
564 |
Dam Height |
42 |
River Or Stream |
LOST RIVER |
Primary Dam Type |
Gravity |
Surface Area |
23960 |
Hydraulic Height |
33 |
Drainage Area |
735 |
Nid Storage |
584050 |
Structural Height |
48 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
48 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pit R Nr Canby Ca
|
56cfs |
Klamath Straits Drain Near Worden
|
1cfs |
Ady Canal At Highway 97
|
39cfs |
North Canal At Highway 97
|
104cfs |
Link River At Klamath Falls
|
928cfs |
Klamath River At Keno
|
698cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Clear Lake
Wilcox Spring To Clear Lake National Wildlife Refuge Boundary