There are about 100 on the island lol... A few on the mainland, but none have many fish, most don't get fished much, and no one in their right mind would say them on an open forum.
Honestly, dig on the internet. I've found a couple dozen spectacular flows on the island now just by looking at old steelhead questionnaire records, recovery programs, swim counts, all that stuff. If you put the hours in on the internet, you'll find some awesome stuff, but it doesn't come easy.
Vedder gets some summers... I've caught 2 in the last 3 years, both in December, both in the upper river. The Vedder also has some really big resident bows, my biggest landed was around 5-6 pounds, also very rare.