I figured it was on 200 between plains and thompson falls also, but then heard from a couple different people it was at mile marker 125 on I-90 (rock creek). Makes sense to me, looks alot more like the interstate than 200.
The cell phone pic I took-that was about 10 miles west of Plains on Hwy 200. The one of the wreck must have been a while back-no snow in the background. Over 30 sheep were hit by vehicles on that stretch of 200 last year...unreal.
My last job had me running to Thompson Falls from Missoula every Tuesday. I pulled over right where you took that picture and ate my lunch every single week (a couple miles east of the thompson river turnoff). Was always tough sneaking my spotting scope into my work truck.
I'm pretty sure the ram was hit the first week of December.