Kenai Spur over Swanson River
Kenai Peninsula Borough, Alaska · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Kenai Spur over Swanson River in Kenai Peninsula Borough, Alaska, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, 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 260 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 50 of the 102 inventoried bridges in Kenai Peninsula Borough rated fair (49.0%); 13 (12.7%) 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 August 2023, 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.
- 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 → (60.79944, -151.01306)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 211 ft |
| Location | Mile Point 38.4 |
| NBI structure number | 0214 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Alaska department of transportation.
Busiest bridges in Kenai Peninsula Borough
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Sterling Highway over Kenai River (soldotna) | 2007 | 15,100 | Fair |
| Kenai Riv Crossing over Kenai River (kenai) | 1974 | 10,000 | Fair |
| Seward Highway over Resurrection River No 1 | 2003 | 6,840 | Good |
| Seward Highway over Resurrection River No 2 | 2003 | 6,840 | Good |
| Seward Highway over Resurrection River No 3 | 2003 | 6,840 | Good |
| Sterling Highway over Moose River | 1993 | 6,360 | Good |
All bridges nearby: Kenai Peninsula Borough, AK bridge conditions · every bridge in Kenai Peninsula Borough · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.