Irr:marine Hwy Rte over Chenega Ramp
Chugach Census Area, Alaska · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr:marine Hwy Rte over Chenega Ramp in Chugach Census Area, Alaska, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1995, making it 30 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2018).
- It is one of 34 of the 65 inventoried bridges in Chugach Census Area rated fair (52.3%); 8 (12.3%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated August 2024, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (60.06413, -148.00838)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel multiple box beam |
| Length | about 130 ft |
| Location | Chenega Bay |
| NBI structure number | 0185 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Chugach Census Area
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Richardson Highway over Valdez Glacier Stream | 1965 | 1,990 | Good |
| Richardson Highway over Robe River | 1980 | 1,990 | Fair |
| Dayville Road over Solomon Creek | 2005 | 1,330 | Good |
| Dayville Road over Abercrombie Creek | 2005 | 1,330 | Good |
| Dayville Road over No Name Creek | 2005 | 1,330 | Good |
| Dayville Road over Lowe River Main Channel | 2006 | 1,330 | Good |
All bridges nearby: Chugach Census Area, AK bridge conditions · every bridge in Chugach Census Area · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.