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Science

The formation information is important in explaining why the lake is so deep. The clarity information is important in explaining why there isn't a greenish tinge that could be associated with algae and bacteria. Without the depth and clarity, the deep blue would probably not be there. However, the reason for the color has to do with an aspect of science.

More specifically, it has to do with light absorption. What we see as sunlight is made up of the colors of the rainbow; red, orange, yellow, green, blue, indigo, and violet. Red has a longer wavelength than violet. Water has the property of absorbing the longer wave length bands of light. For this reason, deep sea fish are often colored red. At depth, they appear black and are difficult to see.

At Crater Lake, because of the depth and clarity of the water, red, orange, yellow, green and much of the blue is absorbed by the water. This leaves the darker shades of blue, as well as indigo and violet, left to reflect back to the eyes of the observer.. Hence, the lake appears amazingly deep blue.

It does need to be stressed that the depth of the water and the clarity of it have a great deal to do with how the sunlight is absorbed. At Crater Lake National Park, the three work together to make this lake the sapphire-colored wonder that it is.