I was at the Sumas/Vedder confluence on Sunday, and saw quite a few boats running out and in, and lots of trailers at the park. I did walk right across the Vedder confluence and water never rose above my knees, so stick close to the Sumas north bank. Also saw a jetboat screaming down Sumas until they noticed the anchored boats, but by then it was too late and the wash was like a tsunami.... hope the naive pilots apologized.