County Road 429 over Wyaconda Rvr
Lewis County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road 429 over Wyaconda Rvr in Lewis County, Missouri, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 9 (excellent condition) on the 0-9 scale.
- It was built in 2025.
- It carries about 50 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 46 of the 172 inventoried bridges in Lewis County rated good (26.7%); 10 (5.8%) are rated poor.
- Its traffic status in the 2025 inventory is new structure not yet open to traffic (NBI item 41).
- It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
- Its most recent inspection on record is dated December 2024, 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 → (40.16845, -91.5866)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 9 | Excellent condition |
| Superstructure | 9 | Excellent condition |
| Substructure | 9 | Excellent condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 214 ft |
| Location | S 17 T 62 N R 6 W |
| NBI structure number | 37412 |
| Condition class | Good |
| Traffic status (item 41) | New structure not yet open to traffic |
| Last inspection (item 90) | December 2024 |
| 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 Missouri department of transportation.
Busiest bridges in Lewis County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 61 S over Big Br CR | 1999 | 14,279 | Fair |
| US 61 S over Bland Br Ck | 2005 | 14,279 | Fair |
| US 61 S over Unnamed CR | 2005 | 14,279 | Fair |
| US 61 S over Unnamed CR | 2005 | 14,279 | Fair |
| US 61 S over Artesian Br CR | 2005 | 7,886 | Fair |
| US 61 N over Waconda Rvr | 2001 | 7,505 | Good |
All bridges nearby: Lewis County, MO bridge conditions · every bridge in Lewis County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.