Currently, there is a 72-hour camping limit and is a city park, which means they don't accept any type of pass or discount such as the Discover Pass. The fee is $10/night (72 hours maximum). But you can still hang out here during the day-use hours until then, if you don't have the money.
I like this area very much. Nothing spectacular, but free showers, free WiFi, bathrooms, water faucet, and water spigot is hard to beat.
You can call them and ask any questions. The number is 509-422-3600
I was searching for free campsites on The Dyrt app and this place showed in the results. Yet, in the description, this place says it charges $20/night. It's really irritating when a place shows up in the results, after I already selected the search criteria filters, then drive all the way to a place and find out the information on the app wasn't accurate. Why am I spending thirty-one thing dollars per month on this app lol?