Actually Parker, I think that one is still a tough call. From the dorsal forward, it sure looks like a coho... especially the cardinal sign of having a light gumline. Kings should have black lips/gums. The spots are also uncharacteristically small for a king.

I will agree with smalma that the wrist looks a little skinny for a silver that size. The anal fin margin also looks too broad for a silver, and it lacks the coho's characteristic "point" from the leading edge of the anal fin. So from the dorsal back, I'll concede it looks more like a chinook.

(Damn, with all that double-speak, I'm starting to sound like John Kerry.... quick, somebody shoot me!)

There's probably a good reason that you have never seen a tributary "king" that was so chrome in all your years of fishing. It could well be a hybrid co-nook (or is that chilver?)... these crosses have been well documented. You might recall a huge 30-plus "coho" caught in SW WA last fall (may have actually been the Lewis) that's still sitting in a WDFW freezer waiting for a definitive DNA analysis on whether it is really a king or a silver.