Clackamas County Bridge Report Card
Clackamas County scores 69 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Clackamas County, Oregon
Clackamas County has 367 bridges in the National Bridge Inventory, with 17 rated poor and 66 rated scour-critical. Its poor-condition share of 4.6% is at or below the 5.1% statewide average. Poor-condition bridges carry about 29,109 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Clackamas County a Bridge Condition Exposure Score of 69/100 (D). The county has 367 bridges in the National Bridge Inventory, including 17 in poor condition and 66 rated scour-critical. Poor-condition bridges carry about 29,109 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 | 4.6% | 9.3 |
| Poor-condition traffic exposure | 25 | 0.6% of measured traffic | 0.5 |
| Scour-critical bridge share | 20 | 18.0% | 20.0 |
| Average age vs national baseline | 10 | 51 years vs 48 nationally | 1.2 |
| Traffic-data completeness | 5 | 4,589,990 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 | 4.6% |
| State Poor-Condition Share | 5.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 18.0% |
| Average Bridge Age | 51 years |
| Poor-Condition Traffic Exposure | 29,109 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Clackamas County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Holly LN over Abernethy Creek | Poor condition + traffic exposure | Poor | 9,700 | 1933 |
| Barlow RD over Rock Creek | Poor condition + traffic exposure | Poor | 1,100 | 1957 |
| Barlow Trail RD over Sandy River | Poor condition + traffic exposure | Poor | 288 | 1953 |
| Kropf Road over Rock Creek | Poor condition + traffic exposure | Poor | 5,600 | 1958 |
| Snuffin RD over Eagle Creek | Poor condition + traffic exposure | Poor | 5,000 | 1956 |
| Eagle Fern RD over North Fork Eagle Creek | Poor condition + traffic exposure | Poor | 4,400 | 1956 |
| Bull Run RD over Bull Run River | Poor condition + traffic exposure | Poor | 865 | 1926 |
| Grimm Road over Woodcock Creek | Poor condition + traffic exposure | Poor | 629 | 1970 |
| Summit Drive over Springbrook Creek | Poor condition + traffic exposure | Poor | 503 | 1956 |
| East Mt Circle over Hackett Creek | Poor condition + traffic exposure | Poor | 293 | 1980 |
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.