Sth 42 - Sth 57 over Sturgeon Bay
Door County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 42 - Sth 57 over Sturgeon Bay in Door County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 14,200 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 17 of the 33 inventoried bridges in Door County rated fair (51.5%); 1 (3.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: superstructure 6 to 5.
- Its most recent inspection on record is dated April 2024, on a 12-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (44.82109, -87.35532)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel movable bascule |
| Length | about 228 ft |
| Location | 1.9M N Jct Cth S |
| NBI structure number | B15000400030000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Door County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sth 42 - Sth 57 over Sturgeon Bay | 1978 | 12,500 | Fair |
| Sth 42 - Sth 57 over Sturgeon Bay | 1978 | 12,500 | Fair |
| Sth 42 - Sth 57 over Sturgeon Bay | 1978 | 12,500 | Fair |
| Sth 42 - Sth 57 over Lrd Memorial Dr | 1978 | 12,500 | Fair |
| Sth 57 NB over Fabry CR | 2008 | 11,200 | Fair |
| Lrd Michigan Stree over Sturgeon Bay | 1930 | 8,300 | Good |
All bridges nearby: Door County, WI bridge conditions · every bridge in Door County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.