Portage Glacier, Alaska
Portage Glacier, 55 miles from Anchorage. Portage Glacier, a river of ice streaming down from the mountains, is perched on 650 feet-deep Portage Lake, surrounded by Mountains and other glaciers, all within the Chugach National Forest.
Why is the Ice Blue? Glacier Ice is formed under the weight of countless snowfalls, which squeezes out most of the air, leaving dense, compact ice. Sunlight, or white light, is made up of all the colors of the spectrum, with each color having a different amount of energy. In regular ice, the air bubbles scatter the light, creating the white appearance. When sunlight strikes glacier ice, the lower energy colors are absorbed by the ice and only the blue color, which has the most energy, is reflected back to the eye. (Info from the Chugach National Forest)