During the period following an election or other action resulting in a boundary change in a district and prior to the date the change becomes effective, the district or districts from which an area will be separated as a result of the boundary change may hold elections for all legal purposes but the electors registered in the area to be separated as a result of the boundary change shall not be qualified to vote in any such election. The election on any measure in such district or districts shall not affect or encumber the area to be separated.
ORS 341.379