San Juan County Bridge Report Card
San Juan County scores 80 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
San Juan County, Washington
San Juan County has 13 bridges in the National Bridge Inventory, with 0 rated poor and 4 rated scour-critical. Its poor-condition share of 0.0% is at or below the 5.6% statewide average.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives San Juan County a Bridge Condition Exposure Score of 80/100 (B). The county has 13 bridges in the National Bridge Inventory, including 0 in poor condition and 4 rated scour-critical. Poor-condition bridges carry about 0 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 | 0.0% | 0.0 |
| Poor-condition traffic exposure | 25 | 0.0% of measured traffic | 0.0 |
| Scour-critical bridge share | 20 | 30.8% | 20.0 |
| Average age vs national baseline | 10 | 46 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 17,878 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 | 0.0% |
| State Poor-Condition Share | 5.6% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 30.8% |
| Average Bridge Age | 46 years |
| Poor-Condition Traffic Exposure | 0 vehicles/day |
Bridges to Watch
Top Bridges to Watch in San Juan County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| SR 20 Extension over Friday Hbr-san Juan Chan | Scour-critical foundation rating | Good | 2,587 | 2005 |
| SR 20 over Harney Channel | Scour-critical foundation rating | Fair | 2,150 | 1979 |
| Extension Of SR 20 over Upright Channel | Scour-critical foundation rating | Fair | 1,349 | 1981 |
| Ferry Traffic over Blind Bay | Scour-critical foundation rating | Fair | 308 | 2004 |
| SR 20 Extension over Friday Hbr-san Juan Chan | High traffic | Fair | 2,587 | 1968 |
| SR 20 over Harney Channel | High traffic | Good | 2,322 | 1959 |
| Deer Harbor Road over Crow Valley Drainage | High traffic | Fair | 1,826 | 2001 |
| Orcas To Olga Road over Cascade Creek | High traffic | Fair | 1,607 | 1921 |
| Extension Of SR 20 over Upright Channel | High traffic | Fair | 1,349 | 1981 |
| Point Lawrence RD over Buck Bay | High traffic | Good | 939 | 2011 |
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.