Local over Drainage
Mahaska County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Local over Drainage in Mahaska County, Iowa, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1900, making it 125 years old at the 2025 inventory.
- It carries about 5 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 67 of the 221 inventoried bridges in Mahaska County rated poor (30.3%); 67 (30.3%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated December 2024, on a 24-month routine inspection cycle.
- 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 → (41.46622, -92.55992)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 20 ft |
| Location | 077152301 |
| NBI structure number | 000000000238120 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 24 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 Mahaska County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 63 over Nenebec Creek | 1998 | 12,500 | Fair |
| Ia 163 over Muchakinok Creek | 1997 | 12,200 | Fair |
| Ia 163 over Little Muchikinock Creek | 1995 | 7,800 | Fair |
| US 63 over Little Muchakinock Creek | 1963 | 6,600 | Fair |
| Ia 92 over Spring Creek/pedestrian | 1958 | 6,400 | Fair |
| US 63 over Stream | 1982 | 6,350 | Good |
All bridges nearby: Mahaska County, IA bridge conditions · every bridge in Mahaska County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.