Or. Const. art. XVII, § 1

Any amendment or amendments to this Constitution may be proposed in either branch of the legislative assembly, and if the same shall be agreed to by a majority of all the members elected to each of the two houses, such proposed amendment or amendments shall, with the yeas and nays thereon, be entered in their journals and referred by the secretary of state to the people for their approval or rejection, at the next regular general election, except when the legislative assembly shall order a special election for that purpose. If a majority of the electors voting on any such amendment shall vote in favor thereof, it shall thereby become a part of this Constitution. The votes for and against such amendment, or amendments, severally, whether proposed by the legislative assembly or by initiative petition, shall be canvassed by the secretary of state in the presence of the governor, and if it shall appear to the governor that the majority of the votes cast at said election on said amendment, or amendments, severally, are cast in favor thereof, it shall be his duty forthwith after such canvass, by his proclamation, to declare the said amendment, or amendments, severally, having received said majority of votes to have been adopted by the people of Oregon as part of the Constitution thereof, and the same shall be in effect as a part of the Constitution from the date of such proclamation. When two or more amendments shall be submitted in the manner aforesaid to the voters of this state at the same election, they shall be so submitted that each amendment shall be voted on separately. No convention shall be called to amend or propose amendments to this Constitution, or to propose a new Constitution, unless the law providing for such convention shall first be approved by the people on a referendum vote at a regular general election. This article shall not be construed to impair the right of the people to amend this Constitution by vote upon an initiative petition therefor.