SH 3 over St Joe River
Benewah County, Idaho · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 3 over St Joe River in Benewah County, Idaho, 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 2019, making it 6 years old at the 2025 inventory.
- It carries about 4,800 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 17 of the 48 inventoried bridges in Benewah County rated good (35.4%); 3 (6.2%) 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 April 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 → (47.31669, -116.56197)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 431 ft |
| Location | In St Maries |
| NBI structure number | 000000000018896 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 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 Idaho department of transportation.
Busiest bridges in Benewah County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 3 over St Maries R;st Maries Br | 1977 | 7,100 | Fair |
| US 95 over RR Roadbed/no Tracks | 1975 | 5,000 | Fair |
| SH 3 over St Maries RR | 2019 | 4,800 | Good |
| US 95 over Sheep Creek | 1975 | 3,500 | Fair |
| US 95 over Hangman Creek | 1975 | 3,500 | Fair |
| SH 5 over Smrr;uprr;plummer Crk | 2016 | 2,600 | Fair |
All bridges nearby: Benewah County, ID bridge conditions · every bridge in Benewah County · Idaho bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.