WA 970 & WA 10 (former US 10) south of Cle Ellum. Popular rendezvous spot for carpooling hikers.

I've always wondered about that one. What is the story behind it? When did it close and what facilities did it have?
FWIW, until about 1969, this was where US 10 and US 97 split, and WA 970 was US 97 until 97 was moved to its current routing circa-1975.
It looks as though I have answered my own question, at least partially. On the WSDOT digital library collection website, I found a document from 2003 about proposed improvements to WA 970. The document makes mention of a "mini-rest area" at the junction between WA 970 and WA 10. It had portable toilets, picnic tables, a parking area and dumpsters. Apparently this site was dismantled "about ten years ago" (which would be circa 1993) due to budget cuts.
Interestingly, the document multiple times mentions the possibility of WSDOT constructing a new rest area at the WA 970 and US 97 junction. But this was 17 years ago, so unlikely to happen.
Also, the rest area located at "Teanaway Juntion" is mentioned in the July, 1963 issue of "Washington Highway News", so it existed at least since then. The mention was in an article about roadside parks. The article states that at time, there were 121 such roadside parks operating in the state.