Local over Trib to Maple River
Monona County, Iowa · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Local over Trib to Maple River in Monona 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 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 41 of the 160 inventoried bridges in Monona County rated poor (25.6%); 41 (25.6%) are rated poor.
- Its traffic status in the 2025 inventory is closed to all traffic (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2024, on a 12-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 → (42.02975, -95.92441)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 3 | 3 | Serious condition |
| Superstructure | 2 | 2 | Critical condition |
| Substructure | 3 | 3 | Serious condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 76 ft |
| Location | 083440102 |
| NBI structure number | 000000000250110 |
| Condition class | Poor |
| Traffic status (item 41) | Closed to all traffic |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Monona County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| NB I-29 over Robinson Ditch | 2011 | 7,800 | Good |
| SB I-29 over Robinson Ditch | 2009 | 7,800 | Good |
| NB I-29 over Cleghorn Creek | 2012 | 7,250 | Good |
| SB I-29 over Cleghorn Creek | 2011 | 7,250 | Good |
| Ia 175 over Mccandlesscleghorn Ditch | 2023 | 5,300 | Good |
| Ia 175 over I-29 | 1959 | 4,090 | Poor |
All bridges nearby: Monona County, IA bridge conditions · every bridge in Monona County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.