Irr:airport Road over Shageluk Slough
Yukon-Koyukuk Census Area, Alaska · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr:airport Road over Shageluk Slough in Yukon-Koyukuk Census Area, Alaska, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 11 vehicles a day (traffic count year 2018).
- Its listed owner is a city or municipal highway agency.
- It is one of 8 of the 94 inventoried bridges in Yukon-Koyukuk Census Area rated poor (8.5%); 8 (8.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (62.65822, -159.53419)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Steel through truss |
| Length | about 126 ft |
| Location | Shageluk |
| NBI structure number | 1414 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Yukon-Koyukuk Census Area
| 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 |
All bridges nearby: Yukon-Koyukuk Census Area, AK bridge conditions · every bridge in Yukon-Koyukuk Census Area · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.