Ferry County recently issued the following announcement on April 30, 2020.
From Gov. Jay Inslee:
To help reduce the spread of COVID-19, all campsites, roofed accommodations (such as cabins, yurts, and vacation houses), group camps, and day use facilities are closed through April 30, 2020. If you have an existing reservation, you will be contacted for a refund. Learn more at the Washington State Parks reservations website.
News reports:
State campgrounds closing through April 30
Original source can be found here.