4300 St. 21.5-A.8 over Middle Creek
Allen County, Kansas · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 4300 St. 21.5-A.8 over Middle Creek in Allen County, Kansas, 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 2004, making it 21 years old at the 2025 inventory.
- It carries about 30 vehicles a day (traffic count year 2006).
- Its listed owner is the county highway agency.
- It is one of 103 of the 227 inventoried bridges in Allen County rated good (45.4%); 25 (11.0%) 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 June 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 → (38.02742, -95.14208)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 101 ft |
| Location | 0.2N 1.5E of Mildred |
| NBI structure number | 000011057505708 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Kansas department of transportation.
Busiest bridges in Allen County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US54 Hwy over Rock Creek | 1969 | 6,854 | Good |
| US-54 Hwy over Rock Creek Overflow | 1998 | 6,854 | Good |
| Old US169 K57 Hwy over Neosho River Drainage | 2002 | 5,500 | Good |
| Old US169 K57 Hwy over Elm Creek | 1948 | 5,500 | Good |
| Old US169 K57 Hwy over Deer Creek Drainage | 1930 | 5,235 | Fair |
| N. Washington Ave. over Coon Creek | 1988 | 5,000 | Fair |
All bridges nearby: Allen County, KS bridge conditions · every bridge in Allen County · Kansas bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.