Clarity is the most obvious sign of Lake Tahoe's health. It has declined by over 30% in the past 40 years as the number of Basin residents and visitors has increased. Why?
Although 63 streams and tributaries flow into Tahoe, only one flows out. Fine sediments from the area's fragile watershed travel this network, remaining suspended in the water, creating cloudiness. The more fine sediments, the cloudier the water.