ORS 308.055

If the assessor fails to commence or continuously and vigorously prosecute the making of the assessment in the manner provided by law, the county court or board of county commissioners may summarily appoint a special assessor. The special assessor shall qualify in the same manner as the assessor. The special assessor shall have all the duties, rights, privileges and emoluments of the assessor in making the assessment for the current year. The acts of the special assessor shall have the same effect as if they had been done by the assessor.