Sth 42 over Manitowoc River
Manitowoc County, Wisconsin · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 42 over Manitowoc River in Manitowoc County, Wisconsin, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 20,634 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 122 of the 277 inventoried bridges in Manitowoc County rated good (44.0%); 13 (4.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 48-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 → (44.09239, -87.66053)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 63 ft |
| Location | at Manitowoc River |
| NBI structure number | B36012800030000 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 48 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 Wisconsin department of transportation.
Busiest bridges in Manitowoc County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih 43 over Fischer Creek | 1976 | 24,400 | Fair |
| Ih 43 over Calvin Creek | 1978 | 23,200 | Fair |
| Ih 43 over Silver Creek | 1978 | 23,200 | Fair |
| Ih 43 over Pine Creek | 1978 | 22,500 | Fair |
| Sth 42 over Manitowoc River | 1987 | 20,634 | Good |
| Ih 43 over Francis Creek | 1976 | 20,000 | Fair |
All bridges nearby: Manitowoc County, WI bridge conditions · every bridge in Manitowoc County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.