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Lyons Reservoir







LYONS RESERVOIR

RESERVOIR LEVELS
March 4, 2025


YEAR OVER YEAR

Created with Highcharts 8.0.0Seasonal Water Storage(acre-ft)1. Jan1. Feb1. Mar1. Apr1. May1. Jun1. Jul1. Aug1. Sep1. Oct1. Nov1. Dec02.5k5k7.5k

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mph

Windspeed

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Humidity

Located in Tuolumne County, California, Lyons is a private hydroelectric dam on the South Fork Stanislaus River. Completed in 1930, this concrete arch dam stands at a height of 132 feet and spans 535 feet in length, providing essential services such as fire protection, irrigation, and hydroelectric power generation. With a maximum storage capacity of 6,228 acre-feet and a drainage area of 66.8 square miles, Lyons plays a crucial role in managing water resources in the region.

Managed by the Federal Energy Regulatory Commission, Lyons has a controlled spillway width of 284 feet and four Tainter radial gates. The dam's hazard potential is classified as high, with a very high risk assessment rating. While the condition assessment is not available, regular inspections and enforcement by state agencies ensure its operational safety and compliance with regulations. As a key structure in the water infrastructure of California, Lyons exemplifies the intersection of water resource management and climate resilience in the face of varying environmental challenges.

The dam's location in Long Barn, California, and its role in the conservation of water resources highlight the importance of sustainable practices and infrastructure investment in mitigating the impacts of climate change. With its historical significance and continued operation under state jurisdiction, Lyons stands as a testament to the ongoing efforts to balance water resource utilization with environmental conservation in the face of evolving climate patterns. For water resource and climate enthusiasts, Lyons offers a fascinating case study in the intersection of engineering, policy, and environmental stewardship.

Storage 24hr Change 0.15%
Percent of Normal 111%
Minimum 4 acre-ft
2019-10-25
Maximum 14,510 acre-ft
2008-09-05
Average 3,550 acre-ft
Nid_Height 132
Drainage_Area 66.8
Year_Completed 1930
Dam_Height 132
Hazard_Potential High
Primary_Dam_Type Concrete
River_Or_Stream South Fork Stanislaus River
Surface_Area 184
Outlet_Gates Tainter (radial) - 4
Nid_Storage 6228
Dam_Length 535
Reservoir Levels
Created with Highcharts 8.0.0Storage22. Aug5. Sep19. Sep3. Oct17. Oct31. Oct14. Nov28. Nov12. Dec26. Dec9. Jan23. Jan6. Feb20. Feb01k2k3k4k5k
Created with Highcharts 8.0.0Pool Elevation22. Aug5. Sep19. Sep3. Oct17. Oct31. Oct14. Nov28. Nov12. Dec26. Dec9. Jan23. Jan6. Feb20. Feb01k2k3k4k5k

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