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Given the tremendous age of the lake, it is hard to pinpoint its geological type. There have been tectonic influences, as the lake bed is crossed by several fault lines. Mount Konocti, an extinct volcano at the south shore (see picture above) also indicates a volcanic influence.
Mount Konocti's last eruption about 10,000 years ago caused a landslide, cutting the then much larger lake in half and separating Clear Lake from a group of smaller lakes, now called the Blue Lakes.
Today, the lake is fed by snow melt from the Sierra Nevada running into the lake in a number of streams.
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