Exhibit 24
CONFIRMING STATEMENT
This statement confirms that the undersigned, S. Miller Williams, has authorized and designated each of Van A. Welch, Brett Luz and Marcie Watson, signing singly, to execute and file on the undersigned's behalf all Forms 3, 4 and 5 (including any amendments thereto) that the undersigned may be required to file with the U.S. Securities and Exchange Commission as a result of the undersigned's ownership of or transactions in securities of Willbros Group, Inc. (the "Company"). The authority of Van A. Welch, Brett Luz and Marcie Watson under this Statement shall continue until the undersigned is no longer required to file Forms 3, 4 and 5 with regard to the undersigned's ownership of or transactions in securities of the Company, unless earlier revoked in writing. The undersigned acknowledges that Van A. Welch, Brett Luz and Marcie Watson are not assuming any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended.
Date: January 25, 2017
| | /s/ S. Miller Williams |
| | S. Miller Williams |
