Multnomah County Bridge Report Card

Multnomah County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C76 / 100

Local infrastructure snapshot

Multnomah County, Oregon

Multnomah County has 473 bridges in the National Bridge Inventory, with 12 rated poor and 32 rated scour-critical. Its poor-condition share of 2.5% is at or below the 5.1% statewide average. Poor-condition bridges carry about 130,989 daily vehicle crossings.

473Total Bridges

12Poor (2.5%)

405Fair (85.6%)

32Scour-Critical

Quote-Ready Local Facts

2.5%of county bridges are in poor condition, compared with 5.1% statewide and 6.7% nationally.

130,989daily vehicle crossings are on poor-condition bridges in the county.

32bridges are rated scour-critical, or 6.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Multnomah County a Bridge Condition Exposure Score of 76/100 (C). The county has 473 bridges in the National Bridge Inventory, including 12 in poor condition and 32 rated scour-critical. Poor-condition bridges carry about 130,989 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	2.5%	5.1
Poor-condition traffic exposure	25	0.9% of measured traffic	0.6
Scour-critical bridge share	20	6.8%	13.5
Average age vs national baseline	10	58 years vs 48 nationally	4.3
Traffic-data completeness	5	15,214,745 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	2.5%
State Poor-Condition Share	5.1%
National Poor-Condition Share	6.7%
County Scour-Critical Share	6.8%
Average Bridge Age	58 years
Poor-Condition Traffic Exposure	130,989 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeNW Broadway Ramp over Broadway ST Conn — 30,388 vehicles/day Oldest Listed BridgeNW Thurman ST over B-15 X Macleay Park — built in 1905 All County BridgesBrowse every bridge record in Multnomah County.

Top Bridges to Watch in Multnomah County

Bridge	Reason	Condition	Daily Traffic	Year Built
Fau9956 over Johnson Creek	Poor condition + traffic exposure	Poor	2,901	1930
NW Broadway Ramp over Broadway ST Conn	Poor condition + traffic exposure	Poor	30,388	1913
HWY 123 over Bnsf	Poor condition + traffic exposure	Poor	14,374	1909
Columbia BLVD over B-78 Over Bnrr	Poor condition + traffic exposure	Poor	13,910	1909
I-84 (hwy 002) EB over Mccord Creek	Poor condition + traffic exposure	Poor	13,746	1962
N Burgard ST over B-1 Over Up/sprr	Poor condition + traffic exposure	Poor	13,113	1930
HWY 1w (steel Br) over Willamette River	Poor condition + traffic exposure	Poor	11,732	1910
174th AVE over Johnson Creek	Poor condition + traffic exposure	Poor	9,838	1950
Us26 (hwy 026ac) over Arthur ST Viaduct	Poor condition + traffic exposure	Poor	8,710	1947
Fas A656 over Sandy River	Poor condition + traffic exposure	Poor	6,445	1914

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.