Copper River Hwy over Mid Fork 18 Mile Creek
Chugach Census Area, Alaska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Copper River Hwy over Mid Fork 18 Mile Creek in Chugach Census Area, Alaska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 9 (excellent condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 170 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 23 of the 65 inventoried bridges in Chugach Census Area rated good (35.4%); 8 (12.3%) 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 September 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (60.46183, -145.30817)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 9 | 9 | Excellent condition |
Bridge details
| Structure | Aluminum or iron culvert |
| Length | about 23 ft |
| Location | Mile Point 18.2 |
| NBI structure number | 4130 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
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.