Adults who believe they may be eligible for OHP Standard can throw their names in the hat online; by mail, fax or in person; or by phone. [Forms: English, Spanish] More details here. Since it’s a State of Oregon website, there is of course no clear link to the online form as of yet; there is also no answer at the 800 number that was to become active at 7 am today, unless “you have dialed a number that is not available from your calling area” counts as an answer. Snow in Salem is my guess.
Update, 10:28 am: The online registration link has now been added to the DHS informational page.