45860 300TH St over Spring Ck
Clay County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 45860 300TH St over Spring Ck in Clay County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2004, making it 21 years old at the 2025 inventory.
- It carries about 70 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 38 of the 93 inventoried bridges in Clay County rated good (40.9%); 14 (15.1%) 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 → (43.03986, -97.03281)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 20 ft |
| Location | 3S & 6.6E Irene |
| NBI structure number | 000000014066030 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Clay County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SD050 over Sd 50 Wl So Dak Owned R | 1981 | 5,147 | Good |
| SD050 over Vermillion Rv | 1981 | 5,147 | Fair |
| SD046 over Blind Ck | 2020 | 3,303 | Good |
| SD050 E over SD050 L | 1977 | 3,094 | Fair |
| SD019 over Vermillion Rv | 1997 | 2,764 | Good |
| SD019 over BNSF RR | 1997 | 2,764 | Good |
All bridges nearby: Clay County, SD bridge conditions · every bridge in Clay County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.