Deep enough to submerge an 80-story building, the lake was carved out over thousands of years of glacial advances. While Salmon make their way into the lake, you may not see them due to the immense deposits of glacial silt. The silt also protects them from predators such as birds and larger fish. However, they eventually make their way to clearer waters. Look for dense blue icebergs from Portage Glacier blown to shore.