EXHIBIT 32.1

CERTIFICATION PURSUANT TO

 18 U.S.C. SECTION 1350,

 AS ADOPTED PURSUANT TO

 SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Orion Marine Group, Inc. (the “Company”) on Form 10-K for the year ended December 31, 2007, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, J. Michael Pearson, President and Chief Executive Officer of the Registrant, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)          The Report fully complies with the requirements of section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)     The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ J. Michael Pearson

J. Michael Pearson

President and Chief Executive Officer

Date:    March 19, 2008