Sumas River.

The Sumas River is a tributary that originates in Whatcom County, Washington just north of the Nooksack River and west of Sumas Mountain. It flows generally northeast, crossing the Canada–United States border and emptying into the Fraser River.

The Sumas River used to flow into Sumas, a large lake in British Columbia, which was part of the Fraser River's floodplain.  In the 1920s, the lake was drained to create more fertile land for Canadian farmers.

Swift Creek, a tributary of the Sumas River, is contaminated with naturally occurring asbestos-laden sediment from the slow-moving Swift Creek Landslide.  In July of 2009, the Whatcom County Health Department and the Washington Department of Health updated their health advisory to include the northern portion of the Sumas River to be contaminated due to Swift Creek's asbestos.

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