FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * INFRASTRUX HOLDINGS, LLC   2. Issuer Name and Ticker or Trading Symbol Willbros Group, Inc.\NEW\ [WG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O TENASKA CAPITAL MANAGEMENT, LLC, 14302 FNB PARKWAY 3. Date of Earliest Transaction (Month/Day/Year) 07/12/2017 (Street) OMAHA, NE 68154 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 07/12/2017   J(1)   8,083,235 D $ 0 (1) 60,730 D   Common Stock 07/12/2017   J(1)   394,176 A $ 0 (1) 394,176 I By Tenaska Power Fund, L.P. Common Stock 07/12/2017   J(1)   13,063 A $ 0 (1) 13,063 I By Tenaska PF G, LLC

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
INFRASTRUX HOLDINGS, LLC C/O TENASKA CAPITAL MANAGEMENT, LLC 14302 FNB PARKWAY OMAHA, NE 68154		X
TENASKA POWER FUND, LP C/O TENASKA CAPITAL MANAGEMENT, LLC 1044 N 115TH STREET, SUITE 400 OMAHA, NE 68154		X
TENASKA PF G, LLC C/O TENASKA CAPITAL MANAGEMENT, LLC 1044 N 115TH STREET, SUITE 400 OMAHA, NE 68154		X
TPF INFRASTRUX HOLDINGS, LLC C/O TENASKA CAPITAL MANAGEMENT, LLC 1044 N 115TH STREET, SUITE 400 OMAHA, NE 68154		X

Signatures

David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P., Manager of INFRASTRUX HOLDINGS, LLC		07/14/2017
**Signature of Reporting Person		Date
David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P., Manager of TPF INFRASTRUX HOLDINGS, LLC		07/14/2017
**Signature of Reporting Person		Date
David Dickey, Vice President & General Counsel, Tenaska PF G, LLC, General Partner of Tenaska Power Fund, L.P.		07/14/2017
**Signature of Reporting Person		Date
David Dickey, Vice President & General Counsel, Tenaska PF G, LLC		07/14/2017
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	The shares were disposed of, or acquired, as applicable, pursuant to a distribution-in-kind to the partners of Tenaska Power Fund, L.P. ("TPF"), with TPF retaining ownership of shares for which the distribution was declined. TPF is the sole owner of TPF InfrastruX Holdings, LLC ("TPF Holdings") and the manager of InfrastruX Holdings, LLC ("IF Holdings"). TPF Holdings is the majority owner of IF Holdings. Tenaska PF G, LLC is a general partner of TPF. IF Holdings is the owner of the shares reported as disposed of herein. All other reporting persons disclaim beneficial ownership of shares reported hereby, except to the extent of any pecuniary interest therein.

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