Exhibit 99.1


                                  CERTIFICATION
                  PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY
              ACT OF 2002 (SUBSECTIONS (A) AND (B) OF SECTION 1350,
                  CHAPTER 63 OF TITLE 18, UNITED STATES CODE)




         Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections
(a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), each
of the undersigned officers of Sterling Construction Company, Inc., a Delaware
corporation (the "Company"), does hereby certify that:

         The Annual Report on Form 10-K for the fiscal year ended December 31,
2002 (the "Form 10-K") of the Company fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and information
contained in the Form 10-K fairly represents, in all material respects, the
financial condition and results of operations of the Company.





Dated:   March 26, 2003                      /S/ Patrick T. Manning
                                           ------------------------
                                           Patrick T. Manning
                                           Chief Executive Officer


Dated:   March 26, 2003                      /S/  Maarten D. Hemsley
                                           -------------------------
                                           Maarten D. Hemsley
                                           Chief Financial Officer