Knox County is considering using a prefabricated bridge to replace the aging bridge structure on Washington Avenue in Vincennes. County Engineer John Sprague says a pre-fab bridge would last longer and cut down on the build time. He says it would take about two weeks to install compared to the 2-3 months it would take to build a bridge. Sprague also says a prefabricated bridge requires less maintenance. The cost for the unit is also comparable to the traditional method. Officials say they expect the materials to cost about 291-thousand dollars. County officials are awaiting the results of soil tests before moving forward.