2011 ORS § 40.135¹
Rule 311. Presumptions

(1) The following are presumptions:

(a) A person intends the ordinary consequences of a voluntary act.

(b) A person takes ordinary care of the persons own concerns.

(c) Evidence willfully suppressed would be adverse to the party suppressing it.

(d) Money paid by one to another was due to the latter.

(e) A thing delivered by one to another belonged to the latter.

(f) An obligation delivered to the debtor has been paid.

(g) A person is the owner of property from exercising acts of ownership over it or from common reputation of the ownership of the person.

(h) A person in possession of an order on that person, for the payment of money or the delivery of a thing, has paid the money or delivered the thing accordingly.

(i) A person acting in a public office was regularly appointed to it.

(j) Official duty has been regularly performed.

(k) A court, or judge acting as such, whether in this state or any other state or country, was acting in the lawful exercise of the jurisdiction of the court.

(L) Private transactions have been fair and regular.

(m) The ordinary course of business has been followed.

(n) A promissory note or bill of exchange was given or indorsed for a sufficient consideration.

(o) An indorsement of a negotiable promissory note, or bill of exchange, was made at the time and place of making the note or bill.

(p) A writing is truly dated.

(q) A letter duly directed and mailed was received in the regular course of the mail.

(r) A person is the same person if the name is identical.

(s) A person not heard from in seven years is dead.

(t) Persons acting as copartners have entered into a contract of copartnership.

(u) A man and woman deporting themselves as husband and wife have entered into a lawful contract of marriage.

(v) A child born in lawful wedlock is legitimate.

(w) A thing once proved to exist continues as long as is usual with things of that nature.

(x) The law has been obeyed.

(y) An uninterrupted adverse possession of real property for 20 years or more has been held pursuant to a written conveyance.

(z) A trustee or other person whose duty it was to convey real property to a particular person has actually conveyed it to the person, when such presumption is necessary to perfect the title of the person or the persons successor in interest.

(2) A statute providing that a fact or a group of facts is prima facie evidence of another fact establishes a presumption within the meaning of this section. [1981 c.892 §20]