Is 29 S over Cst NW 56TH St
Platte County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Is 29 S over Cst NW 56TH St in Platte County, Missouri, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 69,887 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 105 of the 287 inventoried bridges in Platte County rated good (36.6%); 19 (6.6%) 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 October 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 → (39.19628, -94.6208)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 9 | 9 | Excellent condition |
| Substructure | 9 | 9 | Excellent condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 71 ft |
| Location | S 28 T 51 N R 33 W |
| NBI structure number | 36508 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Platte County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 29 N over Cst NW 56TH St | 2021 | 134,485 | Good |
| Is 29 S over Line CR | 1957 | 113,704 | Fair |
| Is 29 N over Mo 45 | 1967 | 64,598 | Fair |
| Is 29 N over Cst NW 72ND St | 2023 | 57,958 | Good |
| Is 29 N over Rt Aa | 2021 | 57,469 | Good |
| Is 635 S over Missouri Rvr UP RR | 1976 | 56,619 | Fair |
All bridges nearby: Platte County, MO bridge conditions · every bridge in Platte County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.