No Data Entered over No Data Entered
Petersburg Borough, Alaska · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- No Data Entered over No Data Entered in Petersburg Borough, Alaska, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 2006, making it 19 years old at the 2025 inventory.
- It is one of 11 of the 137 inventoried bridges in Petersburg Borough rated poor (8.0%); 11 (8.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: deck 6 to 5, superstructure 6 to 5.
- Its most recent inspection on record is dated August 2024, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (56.92977, -132.77372)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 6 | 5 | Fair condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Timber slab |
| Length | about 40 ft |
| Location | Thomas Bay |
| NBI structure number | 100521000003408 |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
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.