478TH Avenue over Ck
Brookings County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 478TH Avenue over Ck in Brookings County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2016, making it 9 years old at the 2025 inventory.
- It carries about 712 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 64 of the 232 inventoried bridges in Brookings County rated good (27.6%); 53 (22.8%) are rated poor.
- 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 → (44.40984, -96.64624)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 66 ft |
| Location | 5.8N Bushnell |
| NBI structure number | 000000006240092 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Brookings County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I029 over Ck | 1966 | 12,240 | Fair |
| I029 over Ck | 1966 | 12,240 | Fair |
| I029 over Ck | 1970 | 9,960 | Fair |
| I029 over Ck | 1970 | 9,960 | Fair |
| I029 over Br Six Mile Ck | 1970 | 9,960 | Fair |
| US014 B over West Br Six Mile Ck | 1967 | 9,030 | Fair |
All bridges nearby: Brookings County, SD bridge conditions · every bridge in Brookings County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.