Future of Lake Tahoe clarity in question as wildfires worsen

With a wildfire no longer threatening Lake Tahoe, residents, tourists and scientists drawn to its clean alpine air, clear blue waters and fragrant pine trees now wonder about the long-term effects that remain

CARSON CITY, Nev. -- When a wildfire crested the mountains near North America's largest alpine lake, embers and ash that zipped across a smoky sky pierced Lake Tahoe’s clear blue waters.

The evacuation order for thousands to flee their homes has been lifted, but those who returned have found black stripes of ash building up on the shoreline — a reminder that success fighting the Caldor Fire won’t insulate the resort region on the California-Nevada line from effects that outlast wildfire season.

Scientists say it’s too soon to draw conclusions about the lasting damage that record-setting wildfires will have on Lake Tahoe. But they’re not wasting time. Many expect to bring their research plans to the Tahoe Science Advisory Council at a meeting Thursday.

Scientists funded by California, Nevada and the League to Save Lake Tahoe are researching lake clarity and biodiversity during and after wildfires. They’re using collection buckets — some loaded with glass marbles — to capture and measure the size and quantity of particles and pollutants from wildfires that have sullied the normally crystal-clear waters. They’re studying how particles enter the lake, how they move around it and the effect on algae production.