… Three to 6 million visitors a year flock to Lake Tahoe, due in large part to the crystal-clear blue water. … But a recently released study by UC Davis on the water’s health shows clarity is the third murkiest since records were taken in the 1960s, with visibility ending at 62.3 feet down — a fair distance from the best clarity level recorded of 102.4 feet. … To protect water health and clarity, environmental groups are turning to new tech — from sand-sifting and surface-skimming robots to a flying water taxi with environmental perks. 

Other Lake Tahoe news:

• University of Nevada, Reno: 2025 Tahoe Co-Lab takes a deep dive into the ecology of the lake