Sth 13 over Marengo River
Ashland County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sth 13 over Marengo River in Ashland County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1971 and reconstructed in 2003, making it 54 years old at the 2025 inventory.
- It carries about 2,800 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 45 of the 84 inventoried bridges in Ashland County rated fair (53.6%); 4 (4.8%) 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 October 2023, 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 → (46.42594, -90.81864)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 152 ft |
| Location | 1.6M N Jct Cth C |
| NBI structure number | B02001200000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2023 |
| 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 Wisconsin department of transportation.
Busiest bridges in Ashland County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ush 2-front St over Bay City Creek | 1969 | 13,205 | Fair |
| Ush Irr (ush 2) over Denomie Creek | 1980 | 5,000 | Fair |
| Ush Irr (ush 2) over Bad River | 1960 | 4,800 | Fair |
| Ush 2 over Kakagon Slough | 1961 | 4,800 | Fair |
| Ush Irr (ush 2) over Beartrap Creek | 1976 | 4,800 | Fair |
| Lrd Main St over Bay City Creek | 1968 | 3,909 | Fair |
All bridges nearby: Ashland County, WI bridge conditions · every bridge in Ashland County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.