As far as I can tell, there aren't any online digital historic congressional district maps online, so the 24 year old atlas is the best resource I could find.
So, in the past hundred years or so, since Washington gave up on at-large districts, there have been three instances where a congressional district spanned the Cascade Curtain:
- In 1909 the 2nd CD
- 1969, the 3rd CD
- 1973, the 4 CD