Ia 21 over Tributary English River
Poweshiek County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ia 21 over Tributary English River in Poweshiek County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1985, making it 40 years old at the 2025 inventory.
- It carries about 1,490 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 82 of the 243 inventoried bridges in Poweshiek County rated fair (33.7%); 95 (39.1%) 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 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 → (41.53175, -92.35566)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 112 ft |
| Location | 3.1 mi. S of IA 85 |
| NBI structure number | 000000000045881 |
| Condition class | Fair |
| 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 Iowa department of transportation.
Busiest bridges in Poweshiek County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-80 over N.fk. English River | 1963 | 28,500 | Fair |
| I-80 over No Fork English River | 1963 | 28,500 | Fair |
| EB I-80 over 50TH Street | 1963 | 14,250 | Fair |
| I 80 WB over UP RR | 2023 | 14,000 | Good |
| WB I-80 over 50TH Street | 1963 | 14,000 | Fair |
| EB I-80 over SR V18 | 1963 | 13,600 | Fair |
All bridges nearby: Poweshiek County, IA bridge conditions · every bridge in Poweshiek County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.