I'VE BEEN LIED TOO!
First time I tried to watch this video the up-load was so 'hurkie-jerkie' I just tossed up my hands and did a 'move on.' This time the up load worked like a good clock.
By the general topo my guess is the fellows were fishing in north central/north east Oregon. That said, amazing to see fish that size just feet from your boots.
"Bucket list" just expanded!
Edit: Appears Brownie's maybe closer than I thought: Wood River, Oregon
'A picture is worth a thousand words. It is hard to find words that describe the Wood River Valley in Fort Klamath, Oregon.Oregon Fly Fishing for Wild Brown Trout, and Redband Rainbow Trout:
Fly fishing the meandering banks of Oregon's Wood River is a quiet step back in time. These slow, clear and cold spring waters hold large numbers of healthy resident brown trout as well as an opportunity to hookup with a lunker migratory Redband rainbow trout. The Wood River is ideal for dry fly fishing with its endless cut banks, and grassy turns. All of this world class fly fishing rests in the shadow of Crater Lake's glory. Fishing the Wood River is a must do while visiting the beautiful Klamath basin.'
Interesting that Google gave me no indication of any plants west of the Cascade Mountains.