145TH Ave SW over Creek
Slope County, North Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 145TH Ave SW over Creek in Slope County, North Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1933, making it 92 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2018).
- Its listed owner is the county highway agency.
- It is one of 7 of the 43 inventoried bridges in Slope County rated fair (16.3%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 6 to 5, superstructure 6 to 5.
- Its most recent inspection on record is dated October 2024, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (46.41726, -103.38411)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 6 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Timber slab |
| Length | about 23 ft |
| Location | 6 South 3 West of Amidon |
| NBI structure number | 000000044132151 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | October 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the North Dakota department of transportation.
Busiest bridges in Slope County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US Highway 85 over Creek | 1991 | 1,080 | Good |
| US Highway 85 over Branch-cannonball River | 1963 | 1,010 | Good |
| US Highway 85 over Philbrick Creek | 1937 | 920 | Good |
| US Highway 12 over Little Missouri River | 1950 | 580 | Fair |
| US Highway 12 over Bnrr Separation | 1984 | 561 | Good |
| US Highway 12 over Little Beaver Creek | 1987 | 520 | Good |
All bridges nearby: Slope County, ND bridge conditions · every bridge in Slope County · North Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.