County road officials and MDOT tell House committee local bridge backlog tops $1 billion; new federal mandates, culvert rules add costs

The Michigan House Transportation and Infrastructure Committee heard two hours of testimony and briefing Thursday on the condition of local bridges, funding shortfalls and new federal inspection and load‑rating requirements that county officials and the Michigan Department of Transportation say will raise costs and risk more closures.

Ed Noyola and Denise Donahue of the County Road Association, joined by an engineering representative from the Michigan Municipal League, told the committee that local agencies face expanding bridge inventories and heavy repair and replacement costs. Noyola said the number of locally owned bridges has risen in part because culverts that are lengthened to meet environmental and bank‑full width standards cross the 20‑foot threshold that federal rules define as a bridge.

"Local roads are in serious condition. And if we don't address them, now, we have no choice but to start closing bridges," Noyola told the committee.

What the presenters said

- Inventory growth and culvert conversions: County officials reported an increase of roughly 153 local bridges since 2015, a trend they attribute largely to culvert upgrades (lengthening and widening for environmental and fish‑passage considerations) that push structures past the 20‑foot federal bridge threshold. "A bridge starts at 20 feet," a presenter said; committee members confirmed the 20‑foot definition is set by federal standards.

- Condition and backlog: The County Road Association cited roughly $265 million in county bridge need reflected in a 2023 county road investment plan and said MDOT has estimated a roughly $1 billion backlog of serious, critical and closed local structures.

- Federal inspection and load‑rating changes: Presenters and MDOT officials described new federal National Bridge Inspection Standards requirements that add data fields to the National Bridge Inventory and require load‑rating analyses for permit vehicles. County officials said all 5,868 local…