There is a nice wave on the canyon section of the N. Fork Nooksack. We call it the Snowwater Wave. It isn't quite park and play, you have to put near (or preferably one rapid above) the bridge near Douglas Fir campground, float down through the first rapid, and at the next rapid, where the river bends right, there is a large rock on the left, forming the eddy that services the wave. T
The wave is nice anywhere from 1000 to about 2000. Above that it gets a bit hard to push into, and flushy.
Take out across the river on the right, walk back to your car through the campground.