I spend most of my time in the Coulee City and Electric City area. On the southwest end of Banks Lake was good for quail a couple years ago but the pressure was to much and it has dropped. Also the Coulee that Jameson Lake is in, I think it's called the Moses Coulee has good numbers of birds.
The key right now is to stay near water, I have had to change locations from my usual from over pressure.
One other note is to not over hunt a covey.
When it starts to get colder the birds need numbers at night to stay warm, if you take too many birds out of a covey you essentially kill the whole covey.
One more thing, if you know a place that has a natural spring, don't tell anyone a keep it a secret. I gaurantee it will have birds near by.