STH312 Eb(old STH1 over Chippewa River
Eau Claire County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- STH312 Eb(old STH1 over Chippewa River in Eau Claire 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 1992 and reconstructed in 1993, making it 33 years old at the 2025 inventory.
- It carries about 12,450 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 119 of the 235 inventoried bridges in Eau Claire County rated fair (50.6%); 22 (9.4%) 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 July 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 → (44.84095, -91.50173)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 1,487 ft |
| Location | 1.2M N Jct Cth F |
| NBI structure number | B18013200000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 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 Eau Claire County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Lrd Hastings Way S over Eau Claire River | 2002 | 48,063 | Fair |
| Ush 12-clairemont over Lrd State St | 1969 | 26,100 | Fair |
| Sth 93 over Lrd Hastings Way | 2005 | 25,500 | Fair |
| Ush 12 over Ush 53 | 2005 | 24,300 | Good |
| Cth Aa over Ush 53 | 1986 | 23,700 | Fair |
| Ush 53 NB over UP RR / Fairway Dr | 2006 | 22,550 | Good |
All bridges nearby: Eau Claire County, WI bridge conditions · every bridge in Eau Claire County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.