Today, Cascade Canyon has numerous polished glacial erratics, hanging cirques and a U-shape as evidences that demonstrate that glaciers once filled the canyon to a depth of at least . Rock debris that was transported out of the canyon by glacial motion formed moraines which now impound the waters of Jenny Lake which is located at the base of the canyon.
Today, Cascade Canyon boasts numerous smoothed glacial fragments, suspended horseshoe-shaped depressions, and a U-shape as evidence that glaciers once filled the canyon to a depth of at least . Rock debris transported out of the canyon by glacial movement formed moraines which now impound the waters of Jenny Lake located at the base of the canyon.