POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby constitutes and appoints each of Timothy P. Boyle, Peter J. Bragdon, Jim Swanson, Richelle Luther and Christina A. Mecklenborg, signing singly, the undersigned's true and lawful attorney-in-fact to:
The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.
The undersigned acknowledges, and agrees to abide by, the Company's policies and to furnish such information, either orally or in writing, as necessary to comply with Section 16 of the Securities Exchange Act of 1934, which may be relied upon by such attorney-in-fact.
This Power of Attorney supersedes any power of attorney previously executed by the undersigned regarding the purposes outlined in the first paragraph hereof ("Prior Powers of Attorney"), and the authority of the attorneys-in-fact named in any Prior Powers of Attorney is hereby revoked.
This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 or 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier (a) revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact or (b) superseded by a new power of attorney regarding the purposes outlined in the first paragraph hereof dated as of a later date.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of April 22, 2022.
/s/ RONALD E. NELSON
Ronald E. Nelson