Crater Lake has announced a closure until further notice:

Crater Lake National Park, in response to Executive Order 20-12 issued by the Governor of the State of Oregon, is announcing additional modifications to operations to support federal, state, and local efforts to slow the spread of the novel coronavirus (COVID-19). As of Tuesday, March 24, 2020, Crater Lake National Park is closed to all park visitors until further notice. This closure will be enforced 24-hours a day/7-days a week and there will be no access permitted to Crater Lake National Park. The only exception is Oregon State Highway 62 through the southern end of the park which will remain open for travel.

More information is available on the Crater Lake National Park Website