Irrsr Nd Hway 1806 over Cannonball River
Morton County, North Dakota · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irrsr Nd Hway 1806 over Cannonball River in Morton County, North Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1962, making it 63 years old at the 2025 inventory.
- It carries about 1,450 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- 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 → (46.41529, -100.63524)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Superstructure | 4 | Poor condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 393 ft |
| Location | 3 North of Nd 24 |
| NBI structure number | 1806034280 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the North Dakota department of transportation.
All bridges nearby: Morton County, ND bridge conditions · North Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.