Bridge conditions in North Slope Borough, Alaska
16 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
1 of the 16 bridges the federal inventory lists in North Slope Borough are rated poor; the rest split 10 good and 5 fair.
- 1 of the 16 bridges in North Slope Borough, Alaska, are rated in poor condition (6.2%) in the 2025 National Bridge Inventory, as of .
- 10 bridges (62.5%) are rated good and 5 (31.2%) fair.
- The median North Slope Borough bridge was built in 1995.
Good 62.5% · Fair 31.2% · Poor 6.2% of 16 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr Bia Rte 002 over Unnamed Stream | 1980 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Dalton Highway over Atigun River No. 2 | 2000 | 130 | Good |
| Dalton Highway over Atigun River No. 1 | 2000 | 130 | Good |
| Dalton Highway over Trevor Creek | 1982 | 130 | Fair |
| Dalton Highway over Roche Moutonnee Creek | 2017 | 130 | Good |
| Dalton Highway over Holden Creek | 2013 | 130 | Good |
| Dalton Highway over Dan Creek | 1982 | 130 | Fair |
| Dalton Highway over Kuparuk River | 1994 | 130 | Fair |
| Dalton Highway over Oksrukuyik Creek No. 2 | 2011 | 130 | Good |
| Dalton Highway over Oksrukuyik Creek No. 1 | 2012 | 130 | Good |
| Dalton Highway over Marx Creek | 1972 | 130 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Alaska: Alaska bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.