Petersburg County Bridge Report Card
Petersburg County scores 79 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Petersburg County, Alaska
Petersburg County has 137 bridges in the National Bridge Inventory, with 11 rated poor and 3 rated scour-critical. Its poor-condition share of 8.0% is above the 7.5% statewide average. Poor-condition bridges carry about 50 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Petersburg County a Bridge Condition Exposure Score of 79/100 (C). The county has 137 bridges in the National Bridge Inventory, including 11 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 50 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 8.0% | 16.1 |
| Poor-condition traffic exposure | 25 | 0.5% of measured traffic | 0.4 |
| Scour-critical bridge share | 20 | 2.2% | 4.4 |
| Average age vs national baseline | 10 | 34 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 10,694 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 8.0% |
| State Poor-Condition Share | 7.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 2.2% |
| Average Bridge Age | 34 years |
| Poor-Condition Traffic Exposure | 50 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Petersburg County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Kake Access - Usfs over Muskeg Creek | Poor condition + traffic exposure | Poor | 10 | 1981 |
| Logging Road over Stream | Poor condition + traffic exposure | Poor | 10 | 2003 |
| 43500 over Log | Poor condition + traffic exposure | Poor | 5 | 2002 |
| 43500 over Log | Poor condition + traffic exposure | Poor | 5 | 2002 |
| 43506 over Log | Poor condition + traffic exposure | Poor | 5 | 2002 |
| 43506 over Log | Poor condition + traffic exposure | Poor | 5 | 2002 |
| 43506 over Log | Poor condition + traffic exposure | Poor | 5 | 2002 |
| No Data Entered over No Data Entered | Poor condition + traffic exposure | Poor | 5 | 2004 |
| Logging Road over Stream | Poor condition | Poor | 0 | 1981 |
| Logging Road over Stream | Poor condition | Poor | 0 | 1981 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.