https://www.oregon.gov/oprd/PCB/Documents/PCB-Salmon-Plate-Project.pdf

Via https://www.oregon.gov/oprd/PCB/Pages/PCB-Oregon-Salmon-Plates.aspx

All the articles I could find that claim “the money doesn’t help salmon” are from 2014. Here’s one with a misleading title - the money is going to all sorts of natural resources programs in the state and to run water resources grants programs https://www.oregonlive.com/environment/2014/12/oregon_license_plate_money_mea.html