Invasive aquatic weeds are spreading in Lake Tahoe, and officials are considering the first-ever use of herbicides in Tahoe to contain the problem, which stems from a man-made lagoon and marina called the Tahoe Keys. Last fall, on one of the last warm days of the year, I pulled into the Tahoe Keys, a quirky subdivision that was built in the 1960s on wetlands in South Lake Tahoe. The dead-end streets and cul de sacs felt like a maze of fingers stretching between water canals and lagoons, like if Venice was a suburb.

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