479TH Avenue over Ck
Brookings County, South Dakota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 479TH Avenue over Ck in Brookings County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1920, making it 105 years old at the 2025 inventory.
- It carries about 92 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 53 of the 232 inventoried bridges in Brookings County rated poor (22.8%); 53 (22.8%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (44.45654, -96.62598)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Steel through truss |
| Length | about 50 ft |
| Location | 1.6N & 1E White |
| NBI structure number | 000000006250059 |
| Condition class | Poor |
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.