Old Br.rd. over Prairie Creek
Linn County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old Br.rd. over Prairie Creek in Linn County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 2 (critical condition) on the 0-9 scale.
- It was built in 1906 and reconstructed in 1989, making it 119 years old at the 2025 inventory.
- It carries about 110 vehicles a day (traffic count year 2021).
- Its listed owner is the county highway agency.
- It is one of 34 of the 511 inventoried bridges in Linn County rated poor (6.7%); 34 (6.7%) are rated poor.
- Its traffic status in the 2025 inventory is closed to all traffic (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: deck 6 to 5, superstructure 4 to 2.
- Status change: newly closed since 2024.
- Its most recent inspection on record is dated September 2024, on a 12-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (41.92299, -91.73042)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 4 | 2 | Critical condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Aluminum or iron through truss |
| Length | about 102 ft |
| Location | 082081204 |
| NBI structure number | 000000000220430 |
| Condition class | Poor |
| Traffic status (item 41) | Closed to all traffic |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Linn County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-380 over E and F Ave NW Cedar Rvr | 1979 | 57,600 | Fair |
| SB I-380 over Cc RR & Ash Pit | 1979 | 41,000 | Fair |
| NB I-380 over Cc RR | 1980 | 38,800 | Fair |
| SB I-380 over Cc RR | 1980 | 38,800 | Fair |
| NB I-380 over H Ave NE | 1980 | 38,800 | Fair |
| SB I-380 over H Ave NE | 1980 | 38,800 | Good |
All bridges nearby: Linn County, IA bridge conditions · every bridge in Linn County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.