Plymouth-annarbor over US-23
Washtenaw County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Plymouth-annarbor over US-23 in Washtenaw County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 10,000 vehicles a day (traffic count year 1978).
- Its listed owner is the state highway agency.
- It is one of 151 of the 262 inventoried bridges in Washtenaw County rated fair (57.6%); 47 (17.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, would be posted or closed except for temporary shoring or other temporary measures (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (42.30664, -83.68703)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 284 ft |
| Location | In Ann Arbor |
| NBI structure number | 000000000010873 |
| Condition class | Fair |
| Traffic status (item 41) | Open, would be posted or closed except for temporary shoring or other temporary measures |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Washtenaw County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 over Huron River | 1971 | 102,776 | Fair |
| I-94 over Aa RR | 1954 | 78,348 | Fair |
| I-94 over Honey Creek | 2000 | 77,206 | Fair |
| US-23 over Horseshoe Lake Drain | 1956 | 66,750 | Fair |
| Gotfredson Road over M-14 | 1975 | 65,500 | Fair |
| M-14 & US-23 Br over Mdot RR Cor & Huron Rvr | 1956 | 59,888 | Fair |
All bridges nearby: Washtenaw County, MI bridge conditions · every bridge in Washtenaw County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.