Cl
− is known to influence corrosion rate of girders of steel bridges. In general, precipitation rate of air-born salt is used to discuss the stability of steel bridges in a corrosion environment. However, residence time of Cl
− on girder is considered to directly affect the corrosion of girders of steel bridges, while precipitation rate of Cl
− is one of the factors in residence time of Cl
−. In addition to precipitation rate of Cl
−, in this study, the Cl
− abundance on web and the quantity of Cl
− removed from web due to rinsing with dewdrop on the girders were analyzed during February to May 2012, in order to examine the residence time of Cl
− on the girder of the bridge. As a result, the residence time of Cl
− on inside-ward web of the girder is calculated to be several tenths to several hundreds days. Though there is a possibility that fluctuation of Cl
− precipitation rate during a month causes error of the residence time, the continuing analysis up to one year for the bridge probably make it possible to yields more reliable residence time of Cl
− on the girder.
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