06/18/2026
For nearly 60 years, UC Davis researchers have tracked 's famed blue waters. The 2025 Clarity Report is out, showing water clarity continues to hold steady at an average of 69.2 feet. Read the full findings https://ucdav.is/43HHAKQ
Image descriptions:
1: High-angle view of a deep blue alpine lake flanked by green pine forests and rugged, snow-capped mountains under a light blue sky. Text: "2025 Lake Tahoe Clarity Report Released". UC Davis logo.
2: A white Secchi disc dips into the blue water next to a research boat. Text: "Clarity is measured as the depth to which a 10-inch white disk, called a Secchi disk, remains visible when lowered into the water." UC Davis logo.
3: Clear, light-blue water of Lake Tahoe revealing large rocks below. Text: "The 2025 Lake Tahoe Clarity Report shows that the annual average clarity remains at a plateau, neither significantly improving nor declining compared to previous years." UC Davis logo.
4: Yellow buoy on the blue surface of Lake Tahoe. Text: "The annual average was 69.2 feet in 2025. That is 7 feet clearer than last year’s average of 62.3 feet, but not statistically different from recent years, mostly due to a continuing trend of relatively low clarity during summer." UC Davis logo.
