ET has this on their site, but Chicago isn't listed:

https://www.ethiopianairlines.com/GA...ential/Lounges

Using the Star Alliance lounger finder tool, it recommends the United Club (which I don't recommend, as it's too far away and that the airport intra-train service is still down).

There's only 1 or 2 open lines for T5 security. Even though there were about 15 people ahead of me the other day, it took about 40 minutes to get through the checkpoint. It's too bad that there isn't a Gold Track offering for T5. One could take the T3-T5 shuttle, but there's limited operating hours and I didn't really feel like checking for the time every few minutes.