County Rd 521 over Maries River
Osage County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Rd 521 over Maries River in Osage 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 2011, making it 14 years old at the 2025 inventory.
- It carries about 15 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 38 of the 99 inventoried bridges in Osage County rated good (38.4%); 17 (17.2%) 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 → (38.36983, -91.98604)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Concrete slab |
| Length | about 184 ft |
| Location | S 24 T 42 N R 10 W |
| NBI structure number | 33498 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Osage County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 50 E over Laughlin CR | 1990 | 10,203 | Fair |
| US 50 E over Linn CR | 1990 | 10,203 | Fair |
| US 63 S over Schmitz CR | 1929 | 9,732 | Fair |
| US 50 W over Osage Rvr Crd Conservat | 1960 | 9,459 | Fair |
| US 63 S over Maries Rvr | 1985 | 7,974 | Good |
| US 63 S over Maries Rvr Ovrfl | 1985 | 7,974 | Fair |
All bridges nearby: Osage County, MO bridge conditions · every bridge in Osage County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.