Big Four Ice Caves Trail Professional Review and Guide
"This trail is best known for the “ice caves” that form at the base of Big Four Mountain. These are not true ice caves but rather accumulations of snow from avalanches that occur in the winter and spring: As the temperature warms up, the snow melts out from underneath, and this is what causes the “caves” to form. The caves are hazardous and signs warn hikers to stay out of them.
Near the marsh you may observe wildlife: Beavers have left their mark on gnawed trees and branches, and you may see birds near the marshes, including hairy woodpeckers, nuthatches, and kingfishers. As for the flowers, you are likely to see fireweed, thimbleberry, elderberry, foamflower, devil’s club, bleeding heart, skunk cabbage, and a variety of ferns, mosses and lichens. In the forest I also saw bead lily, salmonberry, and false lily-of-the-valley, with its graceful heart-shaped leaves."