Richardson Highway over Tanana River Big Delta
Southeast Fairbanks Census Area, Alaska · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Richardson Highway over Tanana River Big Delta in Southeast Fairbanks 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 1966, making it 59 years old at the 2025 inventory.
- It carries about 1,990 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 34 of the 64 inventoried bridges in Southeast Fairbanks Census Area rated fair (53.1%); 7 (10.9%) 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 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 → (64.15734, -145.85243)
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 through truss |
| Length | about 783 ft |
| Location | Mile Point 277.9 |
| NBI structure number | 0524 |
| Condition class | Fair |
| 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 Southeast Fairbanks Census Area
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Richardson Highway over Jarvis Creek | 2015 | 1,880 | Good |
| Delta-nistler Road over Jarvis Creek Overflow #1 | 1996 | 1,250 | Good |
| Delta-nistler Road over Jarvis Creek Overflow #2 | 1996 | 1,250 | Good |
| Delta-nistler Road over Jarvis Creek Overflow #3 | 1996 | 1,250 | Good |
| Richardson Highway over Shaw Creek | 2011 | 1,000 | Good |
| Alaska Highway over Sawmill Creek | 1995 | 750 | Fair |
All bridges nearby: Southeast Fairbanks Census Area, AK bridge conditions · every bridge in Southeast Fairbanks Census Area · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.