Irr:ft Spur Road over Kake Ferry Terminal
Petersburg Borough, Alaska · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr:ft Spur Road over Kake Ferry Terminal in Petersburg Borough, Alaska, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2015, making it 10 years old at the 2025 inventory.
- It carries about 37 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 63 of the 137 inventoried bridges in Petersburg Borough rated good (46.0%); 11 (8.0%) 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 May 2023, 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 → (56.96124, -133.92096)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 131 ft |
| Location | Kake |
| NBI structure number | 0177 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| 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 Petersburg Borough
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nordic Drive over Hammer Slough | 1974 | 4,210 | Fair |
| Ifa Ferry Route over Petersburg S Mitkof Term | 2006 | 2,659 | Good |
| Irr:ptrsbg/kake Rd over Gunnuk Creek | 1981 | 770 | Fair |
| Mitkof Highway over Twin Creek | 1996 | 760 | Good |
| Irr:keku Rd (kake) over Sitkum Creek | 2011 | 270 | Fair |
| Birch Street over Birch Street Viaduct | 1960 | 200 | Fair |
All bridges nearby: Petersburg Borough, AK bridge conditions · every bridge in Petersburg Borough · Alaska bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.