- Nooksack River § South Fork (Wikipedia)
The South Fork Nooksack River, about 50 miles (80 km) long, rises in southern Whatcom County, east of Twin Sisters Mountain near Bell Pass and Lake Wiseman. It flows briefly south, entering Skagit County, then northwest to re-enter Whatcom County. It flows past the town of Acme, and due north until merging with the North Fork near the State Route 9 bridge, 1.6 km (1 mi) southeast of Deming and the Nooksack Indian Reservation.
Mount Baker, WA simplified hazards map (usgs.gov)