Bridge conditions in Petersburg Borough, Alaska
137 inventoried bridges · 11 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
11 of the 137 bridges the federal inventory lists in Petersburg Borough are rated poor; the rest split 63 good and 63 fair.
- 11 of the 137 bridges in Petersburg Borough, Alaska, are rated in poor condition (8.0%) in the 2025 National Bridge Inventory, as of .
- 63 bridges (46.0%) are rated good and 63 (46.0%) fair.
- The median Petersburg Borough bridge was built in 1990.
- The busiest poor-rated bridge is Kake Access - Usfs over Muskeg Creek (built 1981), carrying about 10 vehicles a day.
Good 46.0% · Fair 46.0% · Poor 8.0% of 137 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Kake Access - Usfs over Muskeg Creek | 1981 | 10 | Poor |
| Logging Road over Stream | 2003 | 10 | Poor |
| 43500 over Log | 2002 | 5 | Poor |
| 43500 over Log | 2002 | 5 | Poor |
| 43506 over Log | 2002 | 5 | Poor |
| 43506 over Log | 2002 | 5 | Poor |
| 43506 over Log | 2002 | 5 | Poor |
| No Data Entered over No Data Entered | 2004 | 5 | Poor |
| Logging Road over Stream | 1981 | – | Poor |
| Logging Road over Stream | 1981 | – | Poor |
| No Data Entered over No Data Entered | 2006 | – | Poor |
Busiest bridges in the county
| 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 |
| Mitkof Highway over Falls Creek | 1967 | 180 | Fair |
| Sing Lee Alley over Rasmus Enge Bridge | 1945 | 100 | Fair |
| Mitkof Highway over Unnamed Creek Mp 25.4 | 2011 | 100 | Good |
| Mitkof Highway over Ohmer Creek | 2007 | 80 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Alaska: Alaska bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.