It's pretty much guaranteed that if a fish is large, their populations are threatened. Bluefin tuna, salmon, swordfish, marlin, etc. - maybe not officially on the threatened list but certainly, their populations are vastly diminished.
I'm no expert on sturgeon, but I know their populations are threatened or endangered in many parts of the world. The Great Lakes used to have sturgeon. I've seen photos from the 1800s of stacks of dried sturgeon, piled up like cordwood on Toronto wharves. They were used for fuel!
As for Columbia River populations, a quick scan of the IUCN (International Union for Conservation of Nature) database tells me there is concern but they are not on the officially threatened list.
http://www.iucnredlist.org/search/details.php/234/summ