SE Irwin Rd over Big Lost CR
DeKalb County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SE Irwin Rd over Big Lost CR in DeKalb County, Missouri, 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 1991, making it 34 years old at the 2025 inventory.
- It carries about 25 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 78 of the 238 inventoried bridges in DeKalb County rated good (32.8%); 16 (6.7%) 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 → (39.88338, -94.2527)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 8 | Very good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 171 ft |
| Location | S 34 T 59 N R 30 W |
| NBI structure number | 19245 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in DeKalb County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 35 S over Brushy CR | 1964 | 19,244 | Fair |
| US 36 E over Freeman Br | 1962 | 11,148 | Fair |
| US 36 E over Jordon CR | 1962 | 11,148 | Fair |
| US 69 S over US 36 | 1990 | 9,126 | Fair |
| US 36 W over Is 35 | 1963 | 7,793 | Good |
| US 36 E over Is 35 | 1963 | 6,359 | Good |
All bridges nearby: DeKalb County, MO bridge conditions · every bridge in DeKalb County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.