Duncan North over Hetzler Ditch
Miami County, Ohio · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Duncan North over Hetzler Ditch in Miami County, Ohio, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1956, making it 69 years old at the 2025 inventory.
- It carries about 324 vehicles a day (traffic count year 2018).
- Its listed owner is the county highway agency.
- It is one of 18 of the 312 inventoried bridges in Miami County rated poor (5.8%); 18 (5.8%) 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 February 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 → (40.18667, -84.13667)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel girder and floorbeam |
| Length | about 41 ft |
| Location | 0.68 N of CR197 |
| NBI structure number | 5536308 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | February 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 Ohio department of transportation.
Busiest bridges in Miami County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ir 75 over Ext of Boone Creek | 2001 | 66,840 | Good |
| Ir-75 over Clayton Ext. of Peters C | 1957 | 66,840 | Good |
| Ir-75 over W. Branch of Peters Cree | 1957 | 66,840 | Good |
| Ir-75 over Branch Great Miami River | 1957 | 54,110 | Fair |
| Ir-75 over County Ditch | 1957 | 54,110 | Fair |
| Ir-75 over Howell Extension Ditch | 1957 | 54,110 | Good |
All bridges nearby: Miami County, OH bridge conditions · every bridge in Miami County · Ohio bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.