X0303 4 2009-10-12 0 0000874238 STERLING CONSTRUCTION CO INC STRL 0001205459 HARPER JOSEPH P SR 20810 FERNBUSH LANE HOUSTON TX 77073 1 1 0 0 President & COO Common Stock 2009-10-12 4 S 0 5000 18.97 D 398474 D These shares were sold pursuant to a 10b5-1 trading plan adopted by the Reporting Person on August 14, 2007. This is the weighted average price per share at which the 5,000 shares were sold. 2,800 shares were sold at prices ranging from $18.73 to $18.98 per share and 2,200 shares were sold at prices ranging from $19.01 to $19.14 per share. Upon request, the Reporting Person will provide to the staff of the SEC, to the issuer, or to a security holder the full information regarding the number of shares sold at each separate price. /s/ Roger M. Barzun under a Power of Attorney 2009-10-13