Irr Bia Rte 1 over Eagles Nest Creek
Jackson County, South Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 1 over Eagles Nest Creek in Jackson County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1987, making it 38 years old at the 2025 inventory.
- It carries about 146 vehicles a day (traffic count year 2020).
- It is one of 26 of the 89 inventoried bridges in Jackson County rated good (29.2%); 13 (14.6%) 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 July 2023, on a 24-month routine inspection cycle.
- 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 → (43.66599, -101.77617)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 104 ft |
| Location | 14.5 Km SE of Interior |
| NBI structure number | 00000000000A116 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Dakota department of transportation.
Busiest bridges in Jackson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I090 over Br Big Buffalo Ck | 1968 | 6,560 | Fair |
| I090 W over Whitewater Ck | 1986 | 3,956 | Fair |
| I090 E over Whitewater Ck | 1973 | 3,956 | Fair |
| I090 W over SD073 Ck | 1967 | 3,552 | Fair |
| I090 E over SD073 Ck | 1967 | 3,552 | Good |
| I090 W over County Rd | 1967 | 3,552 | Fair |
All bridges nearby: Jackson County, SD bridge conditions · every bridge in Jackson County · South Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.