You could only see a 10-inch plate at a depth of 64 feet last year in Lake Tahoe; CO2 blamed

Climate change may be muddying Lake Tahoe waters - ContraCostaTimes.com

The average depth at which a 10-inch plate could be seen from a research boat was just 64.4 feet last year, a decline of 3.7 feet from the previous year.
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"It looks like climate change may be behind what we're seeing this year or the last couple of years," said Geoffrey Schladow, director of UC Davis' Tahoe Environmental Research Center.