US 20 over Dd 9 & 13
Calhoun County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 20 over Dd 9 & 13 in Calhoun County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2008, making it 17 years old at the 2025 inventory.
- It carries about 6,900 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 50 of the 198 inventoried bridges in Calhoun County rated good (25.3%); 49 (24.7%) are rated poor.
- 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 → (42.44954, -94.61032)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 24 ft |
| Location | 3.0 mi. E of Jct. IA 4 |
| NBI structure number | 000000000609930 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Calhoun County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over East Cedar Creek | 2008 | 7,000 | Good |
| US 20 over W Fork Camp Creek | 2010 | 5,900 | Good |
| US 20 over Drainage Ditch No 1 & 54 | 2010 | 5,900 | Good |
| US 20 WB over Cc RR | 2011 | 3,450 | Good |
| US 20 EB over Cc RR | 2010 | 3,450 | Good |
| Ia 7 over over Cc RR | 1974 | 2,560 | Fair |
All bridges nearby: Calhoun County, IA bridge conditions · every bridge in Calhoun County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.