If you buy the year pass (for all Oregon state parks) It's $30 for the year.
I just got back, fished the river from 6:30 till 9am. There were five vehicles waiting to get past the gate when I showed up (6:15). I was fishing near 12 other people (I was the first there..but they came pretty quickly after) and I saw one fish caught in that time, so one fish for about 30 man hours fished in that hole, not very good.
I managed to pull in 4 sticks, a leaf, and I snagged my own line and managed to get back a spinner that I had broken off in the first 5 minutes; which I then promply lost again (lost 4 total, at least I know I was deep enough...).
Sandy 1, me 0.