Did you know? The oldest bridge in the NBI was built in 1697.
Did you know? The oldest bridge in the NBI was built in 1697.
Infrastructure Grade
Infrastructure Report Card
11.0% of bridges in poor condition
Total Bridges
11,397
Poor Condition
1,250(11.0%)
Avg Bridge Age
49 yrs
Trend
Stable
| Metric | Michigan | National Avg | Trend |
|---|---|---|---|
| % Poor Condition | 11.0% | 6.7% | Stable |
| vs. National Average | +4.3 pts | -- | -- |
| Average Bridge Age | 49 yrs | 48 yrs | -- |
| Good or Better | 4,510(39.6%) | -- | -- |
Grade Scale
Percentage of bridges in poor condition over time. The dashed line shows the national average for comparison.
Total Bridges
11,397
Poor Condition
1,250(11.0%)
Average Age
49 yrs
Daily Crossings
95.1M
Good or Better
4,510(39.6%)
These bridges have at least one major component rated "5" (Fair) — one step above the poor threshold. Sorted by daily traffic to highlight highest-impact structures at risk.
| Bridge | Location | Deck | Super | Sub | Daily Traffic |
|---|---|---|---|---|---|
| I-96 WB | Oakland County | 5 | 7 | 7 | 182,700 |
| I-94 | Wayne County | 6 | 6 | 5 | 180,032 |
| I-75 | Wayne County | 8 | 5 | 8 | 152,325 |
| I-75 & RAMPS C&D | Wayne County | 5 | 6 | 7 | 152,325 |
| HUBBELL AVE | Wayne County | 5 | 7 | 6 | 143,000 |
| I-696 | Oakland County | 6 | 5 | 7 | 122,300 |
| I-96 | Oakland County | 6 | 5 | 6 | 116,050 |
| I-75 | Wayne County | 7 | 6 | 5 | 103,925 |
| I-75 NB OFF RAMP | Wayne County | 7 | 5 | 6 | 103,925 |
| I-94 | Washtenaw County | 6 | 5 | 5 | 102,776 |
| I-94 | Macomb County | 7 | 7 | 5 | 101,088 |
| I-94 | Macomb County | 7 | 5 | 5 | 99,698 |
| I-94 | Macomb County | 6 | 8 | 5 | 99,300 |
| I-94 | Macomb County | 6 | 5 | 5 | 99,300 |
| M-10 SB NWESTERN | Oakland County | 5 | 5 | 7 | 98,076 |
The 10 bridges in poorest condition, ranked by lowest sufficiency rating.
over BETSIE RIVER
over BIG BEAR CREEK
over SALINE RIVER
over NORTH MACON CREEK
over N BR PENTWATER RIVER
over LITTLE TROUT RIVER
over CISCO BR ONTONAGON RIVER
over PORTAGE RIVER
over S BR MACATAWA RIVER
over BIG POTATO CREEK
States with similar infrastructure profiles, ranked by percentage of bridges in poor condition.
Grading: Grades are based on the percentage of bridges classified as "poor condition." A bridge is in poor condition when at least one major component (deck, superstructure, or substructure) is rated 4 or below on the NBI 0-9 scale.
Data Source: Federal Highway Administration (FHWA) National Bridge Inventory (NBI). Data is updated annually. BridgeStats is not affiliated with or endorsed by the FHWA.
Watchlist Criteria: Bridges with any component rated "5" (Fair) are one step from the poor threshold of 4 and are flagged for monitoring. These bridges are not yet in poor condition but may deteriorate without maintenance.