The 2025 Lake Tahoe Clarity Report shows annual average clarity at 69.2 feet, a plateau with no significant improvement. Researchers continue efforts to restore clarity to historic levels.
- Annual average clarity was 69.2 feet in 2025, 7 feet clearer than 2024 but statistically unchanged. - Clarity remains below the historic 97.4 feet average from 1967-1971.
- Fine particles in upper waters are the main factor governing clarity. - New research in 2026 will investigate phytoplankton and picoplankton using advanced imaging.
The report underscores the need for continued collaborative efforts to protect and restore Lake Tahoe's clarity.