An annual report on Lake Tahoe says the United States' largest alpine lake is still warming at 14 times the historic average.
The finding is in Thursday's annual publication by UC Davis on the condition of Lake Tahoe.
Researchers say the lake is still warming by half of a degree Fahrenheit each year, continuing a four-year trend driven by climate change.
The yearly report cites other signs of climate change at Lake Tahoe, including a spring snow melt this March that started 19 days earlier than it did in 1961.
The university researchers say climate change is contributing to the growth of algae, reducing its clarity.