IMO, they are still open until I see an RCW/closure order posted that says the rivers are closed. I don't go by news articles as they don't mean anything relevant. I have been fishing the naches after work since Saturday and have seen a game warden drive by 3 times 
I guess it matters where and when you are fishing. I think it's pretty clear.
July 17, 2015
Select Yakima Basin tributaries to close to fishing for game fish due to drought
Actions: Partially or completely close current seasons for game fish in select areas to reduce drought-related injury and/or mortality.
Effective date: July 18, 2015, until further notice
Species affected: All game fish (trout, whitefish, etc.)
Locations:
1) Ahtanum Creek, including North and Middle Forks: Closed
2) Naches River from Tieton River to Bumping River/Little Naches River: Closed 2:00 p.m. until 12:00 midnight
3) Rattlesnake Creek: Closed 2:00 p.m. until 12:00 midnight
4) Little Naches River: Closed
5) Teanaway River, including West, Middle and North Forks: Closed