County Rd 403 over South Rvr
Marion County, Missouri · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Rd 403 over South Rvr in Marion County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1986, making it 39 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 100 of the 186 inventoried bridges in Marion County rated fair (53.8%); 17 (9.1%) 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 February 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.78333, -91.501)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 90 ft |
| Location | S 31 T 58 N R 5 W |
| NBI structure number | 18369 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Marion County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 61 S over Minnow CR | 1930 | 29,762 | Fair |
| US 24 E over Drain Dtch | 1928 | 19,835 | Fair |
| US 24 E over BNSF RR | 1992 | 19,828 | Good |
| Is 72 E over Rp US61S to IS72E Rp Is | 2000 | 19,756 | Good |
| US 61 S over James CR | 1930 | 19,001 | Fair |
| Is 72 E over Mississippi Rvr Cst 410 | 2000 | 17,638 | Poor |
All bridges nearby: Marion County, MO bridge conditions · every bridge in Marion County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.