Irr Bia Rte Allen over Trib of White River
Bennett County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte Allen over Trib of White River in Bennett 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 2017, making it 8 years old at the 2025 inventory.
- It carries about 300 vehicles a day (traffic count year 2023).
- It is one of 2 of the 15 inventoried bridges in Bennett County rated good (13.3%); 3 (20.0%) 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 → (43.27919, -101.92158)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 27 ft |
| Location | East of Allen |
| NBI structure number | 0000A06344B0161 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Bennett County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US018 over Ck | 1951 | 906 | Fair |
| US018 over Trib Little White Rv | 2020 | 573 | Good |
| SD073 over Little White Rv | 1964 | 522 | Fair |
| SD073 over Lake Ck | 1964 | 522 | Fair |
| 290 Street over Ck | 1954 | 123 | Fair |
| 231 Avenue over Ck | 1954 | 123 | Fair |
All bridges nearby: Bennett County, SD bridge conditions · every bridge in Bennett County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.