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 features numerous smoothed rocks, suspended natural amphitheaters, and a U-shape that serve as evidence of past glacier coverage to a depth of at least . The rock debris carried out of the canyon by glacial forces formed moraines which now impound Jenny Lake situated at the base of the canyon.