When a big river hits a roadblock it often carves a canyon. At the end of the last ice age, a moraine blocked the Sunwapta River’s northerly course. The water spilled into a rock fault and created Sunwapta Falls (now 18.5 m, or 61 ft., high) and the canyon of today. Walk a pleasant trail 1.4 km (0.9 mi) from the upper falls through a pine forest to views of other cascades.