This report provides information regarding corrosion-induced deterioration of both reinforced concrete and steel bridges exposed to chlorides. This is a pervasive problem that challenges the design of new structures and the maintenance of existing ones. Because of concerns regarding long-term serviceability of epoxy-coated reinforcing steel in bridge decks and substructures, enhanced attention has focused on these materials in recent years. An important consideration in the case of existing steel bridges is the development of monitoring methods and technologies for characterizing the deterioration rate. For exposed steel surfaces, determination of the as-constructed deterioration rates is critically important for maintenance schedules, especially for weathering steels.