Skagit River - Course

Course

The Skagit River rises at Allison Pass in the Canadian Cascades of British Columbia. From there it flows northwest along the Crowsnest Highway, which follows the river into Manning Provincial Park. It turns abruptly south where it receives Snass Creek from the right, then receives the Klesilkwa River from the left, and turns southeast to flow into Ross Lake where it crosses the Canada-United States border and into Washington state.

Ross Lake is formed by Ross Dam and is approximately 24 miles (39 km) long, winding south through Ross Lake National Recreation Area. Here the river receives Beaver Creek from the right and Ruby Creek from the left. Spilling out of the dam the river enters Diablo Lake, formed by Diablo Dam, and receives Thunder Creek and Colonial Creek from the left, then enters the third and final reservoir, Gorge Lake, formed by Gorge Dam. All three dams are part of the Skagit River Hydroelectric Project.

Past Gorge Dam, the river is often dry as its waters have been diverted to generate hydroelectricity. However, this water is returned to the river as it passes Newhalem, a company town for Seattle City Light. Copper Creek and Bacon Creek, both flowing from North Cascades National Park, merge into the Skagit from the right as it meanders slowly through an agricultural valley, past Marblemount, where the Cascade River joins from the left, and Rockport, where it receives its major tributary, the Sauk River, from the left.

After receiving the Sauk River, the Skagit turns west, flowing past Concrete and receiving the Baker River, its second largest tributary, from the right. The river flows west, past Sedro-Woolley and Mount Vernon, and at the former site of Skagit City it diverges into two forks, a north and south fork, forming Fir Island. These two forks both empty into Skagit Bay, a branch of Puget Sound.