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 Quarterly Report on Form 10-Q for the quarter ended June 30, 2002
(the "Form 10-Q") 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-Q fairly represents, in all material respects, the financial
condition and results of operations of the Company.





Dated:   August 9, 2002               /s/ Patrick T. Manning
                                      -----------------------
                                      Patrick T. Manning
                                      Chief Executive Officer


Dated:   August 9, 2002               /s/  Maarten D. Hemsley
                                      ------------------------
                                      Maarten D. Hemsley
                                      Chief Financial Officer