Point of Information Crossing the Skeena River, BC. Photo looking east at the Skeena River, BC. The Skeena River is the second-largest river in British Columbia. The Skeena is approximately 582 kilometres in length. The Stewart-Cassiar Highway The Stewart-Cassiar Highway runs from the junction of Highway #16 (The Yellowhead Route) north to the Yukon border and connects with The Alaska Highway.This highway offers some of the most awe-inspiring scenery, with wild rivers, deep canyons and wildlife that you will encouter along the way.