County Rd 420 over Drain Dtch
Scott County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Rd 420 over Drain Dtch in Scott 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 2001, making it 24 years old at the 2025 inventory.
- It carries about 25 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 71 of the 184 inventoried bridges in Scott County rated good (38.6%); 15 (8.2%) 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 January 2025, 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 → (37.05284, -89.75369)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 72 ft |
| Location | S 28 T 28 N R 12 E |
| NBI structure number | 31318 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2025 |
| 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 Scott County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 55 S over SW Ramsey CR | 1962 | 26,540 | Fair |
| Is 55 S over Illmo Br | 1962 | 26,540 | Fair |
| Is 55 S over Town Dtch | 1962 | 24,249 | Fair |
| Is 55 S over Lateral Dtch No 4 | 1962 | 24,249 | Fair |
| Is 55 S over Ramsey CR | 1954 | 18,355 | Fair |
| Is 55 S over Dtch No 2 | 1950 | 18,355 | Fair |
All bridges nearby: Scott County, MO bridge conditions · every bridge in Scott County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.