Oregon Revised Statutes Labor and Employment; Unlawful Discrimination § 659A.165

(1) Except as provided in subsection (2) of this section, a covered employer may require an eligible employee to give the employer written notice at least 30 days before commencing family leave. The employer may require the employee to include an explanation of the need for the leave in the notice.

(2) An eligible employee may commence taking family leave without prior notice under the following circumstances:

(3) If an employee commences leave without prior notice under subsection (2) of this section, the employee must give oral notice to the employer within 24 hours of the commencement of the leave, and must provide the written notice required by subsection (1) of this section within three days after the employee returns to work. The oral notice required by this subsection may be given by any other person on behalf of the employee taking the leave.

(4) Except as provided in this subsection, if the employee fails to give notice as required by subsections (1) and (3) of this section, the employer may reduce the total period of family leave authorized by ORS 659A.162 by three weeks, and the employee may be subject to disciplinary action under a uniformly applied policy or practice of the employer. A reduction of family leave under this subsection may not limit leave described in ORS 659A.159 (1)(e).