Lake Crescent, a cold, clear, glacially-carved lake, owes its existence to ice. Its azure depths, which plummet to 624 feet, were gouged by huge ice sheets thousands of years ago. As the ice retreated, it left behind a steep valley that filled with the clear blue waters of Lake Crescent.
The lake's waters have very little nitrogen. This limits the growth of phytoplankton, tiny plants (like algae) that float in lake waters. Without them, the water stays clear. In some places you might see as far down as 60 feet. Clarity and reflecting light give Lake Crescent its stunning blue-green color. Its protected waters are home to fish like the Beardslee and Crescenti trout, two types of fish found nowhere else in the world.