C20 130TH St over Truliner Creek
Humboldt County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- C20 130TH St over Truliner Creek in Humboldt County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2018, making it 7 years old at the 2025 inventory.
- It carries about 530 vehicles a day (traffic count year 2019).
- Its listed owner is the county highway agency.
- It is one of 34 of the 87 inventoried bridges in Humboldt County rated good (39.1%); 7 (8.0%) 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 November 2024, on a 48-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 → (42.86316, -94.20881)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 8 | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 25 ft |
| Location | Humboldt County |
| NBI structure number | 000000000029061 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 48 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 Iowa department of transportation.
Busiest bridges in Humboldt County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 169 over W Fork Des Moines River | 1997 | 7,100 | Fair |
| US 169 over Indian Creek | 2011 | 5,400 | Good |
| Ia 3 over Stream | 1939 | 4,590 | Good |
| Sumner Ave SW over West Des Moines River | 2015 | 3,472 | Good |
| US 169 over Drainage Ditch | 1985 | 3,220 | Fair |
| US 169 over Bloody Run Creek | 1985 | 3,220 | Fair |
All bridges nearby: Humboldt County, IA bridge conditions · every bridge in Humboldt County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.