Bridge conditions in Yukon-Koyukuk Census Area, Alaska
94 inventoried bridges · 8 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 94 bridges in Yukon-Koyukuk Census Area: 41 rated good, 45 fair, and 8 poor.
- 8 of the 94 bridges in Yukon-Koyukuk Census Area, Alaska, are rated in poor condition (8.5%) in the 2025 National Bridge Inventory, as of .
- 41 bridges (43.6%) are rated good and 45 (47.9%) fair.
- The median Yukon-Koyukuk Census Area bridge was built in 1972.
- The busiest poor-rated bridge is Irr:steese Highway over Crooked Creek (built 1957), carrying about 110 vehicles a day.
Good 43.6% · Fair 47.9% · Poor 8.5% of 94 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:steese Highway over Crooked Creek | 1957 | 110 | Poor |
| Dalton Highway over Hammond River | 1972 | 110 | Poor |
| Irr: Airfield Rd over Gold Creek | 1972 | 86 | Poor |
| Sterling L/ophir over Takotna River | 1941 | 45 | Poor |
| Sterling L/ophir over California Creek | 1937 | 45 | Poor |
| Sterling L/ophir over Spruce Creek | 1964 | 45 | Poor |
| Irr:airport Road over Shageluk Slough | 1978 | 11 | Poor |
| Happy Creek Road over Otter Creek | 1947 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Parks Highway over North Slough Tanana Riv | 1967 | 1,710 | Fair |
| Parks Highway over Tanana River at Nenana | 1967 | 1,710 | Fair |
| Parks Highway over Little Goldstream Ck | 2021 | 1,570 | Good |
| Parks Highway over Monderosa Overhead | 2003 | 1,570 | Good |
| Parks Highway over Fish Creek | 1965 | 1,410 | Fair |
| Denali Park Road over Savage River | 1983 | 1,300 | Fair |
| Denali Park Road over Sanctuary River | 1956 | 1,300 | Fair |
| Denali Park Road over Teklanika River | 1955 | 1,300 | Fair |
| Denali Park Road over Igloo Creek | 1966 | 1,300 | Fair |
| Denali Park Road over Igloo Creek | 1956 | 1,300 | 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.