Washington County Bridge Report Card
Washington County scores 73 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Washington County, Oregon
Washington County has 334 bridges in the National Bridge Inventory, with 11 rated poor and 37 rated scour-critical. Its poor-condition share of 3.3% is at or below the 5.1% statewide average. Poor-condition bridges carry about 59,775 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Washington County a Bridge Condition Exposure Score of 73/100 (C). The county has 334 bridges in the National Bridge Inventory, including 11 in poor condition and 37 rated scour-critical. Poor-condition bridges carry about 59,775 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 | 3.3% | 6.6 |
| Poor-condition traffic exposure | 25 | 1.2% of measured traffic | 0.9 |
| Scour-critical bridge share | 20 | 11.1% | 20.0 |
| Average age vs national baseline | 10 | 42 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 5,007,917 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 | 3.3% |
| State Poor-Condition Share | 5.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 11.1% |
| Average Bridge Age | 42 years |
| Poor-Condition Traffic Exposure | 59,775 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Washington County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| US 26 (hwy 047) over West Fork Dairy Creek | Poor condition + traffic exposure | Poor | 9,574 | 1940 |
| Tigard Street over Fanno Creek | Poor condition + traffic exposure | Poor | 5,667 | 1958 |
| Turk Road over West Fork Dairy Creek | Poor condition + traffic exposure | Poor | 208 | 1961 |
| SW 205th AVE over Beaverton Creek | Poor condition + traffic exposure | Poor | 14,741 | 1960 |
| HWY 29 over Pnwr & Scoggin Creek | Poor condition + traffic exposure | Poor | 12,233 | 1967 |
| HWY 140 over Jackson Bottom Slough | Poor condition + traffic exposure | Poor | 8,728 | 1966 |
| North Dakota ST over Fanno Creek | Poor condition + traffic exposure | Poor | 6,925 | 1962 |
| Uebel Road over E Fork Dairy Creek | Poor condition + traffic exposure | Poor | 1,202 | 1973 |
| Bohmann Parkway over Fanno Creek | Poor condition + traffic exposure | Poor | 282 | 1957 |
| Rein Road over Cedar Creek | Poor condition + traffic exposure | Poor | 214 | 1978 |
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.