US 59 over Lyon Creek
Shelby County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 59 over Lyon Creek in Shelby County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 3,240 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 111 of the 207 inventoried bridges in Shelby County rated fair (53.6%); 18 (8.7%) 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 May 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (41.73979, -95.34326)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 191 ft |
| Location | 2.6 mi. S of Jct. IA 37 |
| NBI structure number | 000000000047800 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 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 Iowa department of transportation.
Busiest bridges in Shelby County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 59 over Drainage Ditch | 1966 | 5,000 | Fair |
| US 59 over Drainage Ditch | 1970 | 4,940 | Fair |
| US 59 over West Nishnabotna River | 1970 | 4,940 | Fair |
| US 59 over Jensen Creek | 1968 | 4,680 | Fair |
| Ia 44 over West Nishnabotna River | 1978 | 3,960 | Fair |
| US 59 over Drainage | 1970 | 3,080 | Good |
All bridges nearby: Shelby County, IA bridge conditions · every bridge in Shelby County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.