Us-31|m-37|m-72|gr over Boardman River

Grand Traverse County, Michigan · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Us-31|m-37|m-72|gr over Boardman River in Grand Traverse County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 1951, making it 74 years old at the 2025 inventory.
• It carries about 26,650 vehicles a day (traffic count year 2015).
• Its listed owner is the state highway agency.
• It is one of 17 of the 33 inventoried bridges in Grand Traverse County rated good (51.5%); 2 (6.1%) are rated poor.
• A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

View this bridge on a map → (44.76476, -85.6128)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.