Percentage of Structurally Deficient Bridges

Why it Matters: Transportation and distribution of commercial and industrial goods and materials require sound bridges and well-maintained roads. A highway bridge is classified as structurally deficient if the deck, superstructure, substructure or culvert is rated in "poor" condition. A bridge can also be classified as structurally deficient if its load-carrying capacity is significantly below current design standards or if a waterway below frequently overtops the bridge during floods. Repairs for bridges rated as structurally deficient are normally eligible for federal bridge funds. A bridge rated as structurally deficient does not mean it is unsafe. This is a measure of the percent of all bridges in Michigan that that are classified as deficient for all categories of bridges and all categories of deficiency.