US-41 over Carp Creek
Marquette County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-41 over Carp Creek in Marquette County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1979 and reconstructed in 2024, making it 46 years old at the 2025 inventory.
- It carries about 14,675 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 69 of the 147 inventoried bridges in Marquette County rated good (46.9%); 19 (12.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (deck 5 to 8, superstructure 6 to 7, substructure 6 to 7).
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- 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 → (46.49838, -87.68316)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 8 | Very good condition |
| Superstructure | 6 | 7 | Good condition |
| Substructure | 6 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 39 ft |
| Location | In Ishpeming |
| NBI structure number | 000000000006498 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Marquette County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Us-41|m-28 over Carp River | 1936 | 23,600 | Fair |
| US-41 over Ls&i RR | 1979 | 13,542 | Fair |
| M-28 over Chocolay River | 2005 | 9,335 | Good |
| US-41 NB over Carp River | 1955 | 8,662 | Fair |
| US-41 SB over Carp River | 1958 | 8,662 | Fair |
| M-553 over Canadian National RR | 1976 | 7,200 | Poor |
All bridges nearby: Marquette County, MI bridge conditions · every bridge in Marquette County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.