The improved ranking will lift some public health restrictions as a reward for the counties vaccinating at least 65% of adult residents.
Gov. Kate Brown on Monday announced the forthcoming rule, which will apply to lower risk counties.
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At the same time, the progress in vaccinations means that five counties qualify for the lower risk category and can increase business activities.
Multnomah County officials said they could not submit their plan in time to potentially qualify to move into the "lower risk" category this Friday.
The governor's decision follows new federal guidance released Thursday, but the state has not yet explained how it applies to retailers, restaurants and other similar businesses.
Currently, just under 60% of state residents 16 and older have received at least a first shot of the COVID-19 vaccine though rates are higher in Multnomah, Washington and some other counties.
The governor hopes a “solid majority” of Oregonians will be vaccinated by June, but she declines to put a number on that.