 WI2 – low-angled (60 degree consistent ice), with good technique can be easily climbed with one ice axe.Grades beyond this generally require the use of two ice tools.WI3 – generally sustained in the 60–70 degree range with occasional near-vertical steps up to 4 metres (Cascade Waterfall, Banff; This House of Sky, Ghost River)

WI4 – near-vertical steps of up to 10 metres, generally sustained climbing requiring placing protection screws from strenuous stances (Professor's Falls, Banff; Weeping Wall Left, Icefields Parkway, Banff; Silk Tassle, Yoho; Moonlight & Snowline, Kananskis)

WI4+ – highly technical WI4.