I090 W over Platte Ck
Aurora County, South Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I090 W over Platte Ck in Aurora County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1964, making it 61 years old at the 2025 inventory.
- It carries about 4,425 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 29 of the 61 inventoried bridges in Aurora County rated fair (47.5%); 7 (11.5%) 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 September 2022, on a 48-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 → (43.73582, -98.76933)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 105 ft |
| Location | 3.2 W White Lake Interch |
| NBI structure number | 000000002014137 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2022 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 7: scour countermeasures installed |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Aurora County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I090 over Ck | 1965 | 9,890 | Fair |
| I090 E over Platte Ck | 1964 | 4,425 | Fair |
| US281 over I090 | 1965 | 1,694 | Fair |
| US281 over Ck | 2007 | 1,434 | Good |
| US281 over West Br Firesteel Ck | 1959 | 1,284 | Fair |
| US281 over Ck | 1960 | 1,284 | Fair |
All bridges nearby: Aurora County, SD bridge conditions · every bridge in Aurora County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.