Check out

http://www.boat.iac.wa.gov/launches.asp?county=Skagit#29

I don't see it here but there is a launch on the south side of the river at Fabor's Ferry too. It's a right turn off the Sauk-Concrete road. Skagitview Rd. maybe? This is the one I use when floating out of the suck........I mean Sauk.