Fm-mahogany Rd over Simon Run
Pottawattamie County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Fm-mahogany Rd over Simon Run in Pottawattamie County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1976, making it 49 years old at the 2025 inventory.
- It carries about 199 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 219 of the 557 inventoried bridges in Pottawattamie County rated good (39.3%); 50 (9.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: superstructure 8 to 7.
- Its most recent inspection on record is dated April 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 → (41.39061, -95.83237)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 125 ft |
| Location | 076431803 |
| NBI structure number | 000000000289031 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 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 Pottawattamie County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-480 & US 6 over Missouri River & RR | 1966 | 53,700 | Fair |
| I-80 EB over Missouri River Rd & RR | 1972 | 31,550 | Fair |
| I 80 & US 6 over Little Mosquito Creek | 1966 | 31,100 | Fair |
| I 80 WB over Missouri Rvr Rd RR | 2010 | 25,250 | Good |
| I 29 SB over I-80 & I-29 Interchange | 2014 | 23,900 | Good |
| I-80 over Bedell Creek | 1965 | 23,800 | Fair |
All bridges nearby: Pottawattamie County, IA bridge conditions · every bridge in Pottawattamie County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.