Columbia County Bridge Report Card

Columbia County scores 58 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

F58 / 100

Local infrastructure snapshot

Columbia County, Oregon

Columbia County has 128 bridges in the National Bridge Inventory, with 12 rated poor and 39 rated scour-critical. Its poor-condition share of 9.4% is above the 5.1% statewide average. Poor-condition bridges carry about 17,915 daily vehicle crossings.

128Total Bridges

12Poor (9.4%)

74Fair (57.8%)

39Scour-Critical

Quote-Ready Local Facts

9.4%of county bridges are in poor condition, compared with 5.1% statewide and 6.7% nationally.

17,915daily vehicle crossings are on poor-condition bridges in the county.

39bridges are rated scour-critical, or 30.5% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Columbia County a Bridge Condition Exposure Score of 58/100 (F). The county has 128 bridges in the National Bridge Inventory, including 12 in poor condition and 39 rated scour-critical. Poor-condition bridges carry about 17,915 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	9.4%	18.8
Poor-condition traffic exposure	25	5.0% of measured traffic	3.7
Scour-critical bridge share	20	30.5%	20.0
Average age vs national baseline	10	47 years vs 48 nationally	0.0
Traffic-data completeness	5	358,315 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	9.4%
State Poor-Condition Share	5.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	30.5%
Average Bridge Age	47 years
Poor-Condition Traffic Exposure	17,915 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeOr 47 (hwy 102) over Rock Creek — 4,450 vehicles/day Oldest Listed BridgeC Street West over Nice Creek — built in 1911 All County BridgesBrowse every bridge record in Columbia County.

Top Bridges to Watch in Columbia County

Bridge	Reason	Condition	Daily Traffic	Year Built
Scappoose-vernonia over S Fk Scappoose Creek	Poor condition + traffic exposure	Poor	2,926	1957
Apiary Road over Oak Ranch Creek	Poor condition + traffic exposure	Poor	1,200	2009
Scappoose-vernonia over East Fork Nehalem River	Poor condition + traffic exposure	Poor	991	1952
Fishhawk Creek RD over Nehalem River	Poor condition + traffic exposure	Poor	451	1963
Or 47 (hwy 102) over Rock Creek	Poor condition + traffic exposure	Poor	4,450	1930
Or 47 (hwy 102) over Nehalem River	Poor condition + traffic exposure	Poor	2,938	1938
Watts Road over S Fk Scappoose Creek	Poor condition + traffic exposure	Poor	1,667	1962
Mayger Road over Beaver Creek	Poor condition + traffic exposure	Poor	1,339	1961
C Street West over Nice Creek	Poor condition + traffic exposure	Poor	732	1911
Scappoose-vernonia over Crown Z Road	Poor condition + traffic exposure	Poor	562	1963

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.