Orange County Bridge Report Card

Orange County scores 93 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

A93 / 100

Local infrastructure snapshot

Orange County, California

Orange County has 1,181 bridges in the National Bridge Inventory, with 33 rated poor and 1 rated scour-critical. Its poor-condition share of 2.8% is at or below the 4.9% statewide average. Poor-condition bridges carry about 1,147,213 daily vehicle crossings.

1,181Total Bridges

33Poor (2.8%)

479Fair (40.6%)

1Scour-Critical

Quote-Ready Local Facts

2.8%of county bridges are in poor condition, compared with 4.9% statewide and 6.7% nationally.

1,147,213daily vehicle crossings are on poor-condition bridges in the county.

1bridges are rated scour-critical, or 0.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Orange County a Bridge Condition Exposure Score of 93/100 (A). The county has 1,181 bridges in the National Bridge Inventory, including 33 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 1,147,213 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	2.8%	5.6
Poor-condition traffic exposure	25	1.9% of measured traffic	1.4
Scour-critical bridge share	20	0.1%	0.2
Average age vs national baseline	10	46 years vs 48 nationally	0.0
Traffic-data completeness	5	61,966,755 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	2.8%
State Poor-Condition Share	4.9%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.1%
Average Bridge Age	46 years
Poor-Condition Traffic Exposure	1,147,213 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeState Route 55 over Lincoln AVE — 227,000 vehicles/day Oldest Listed BridgeYorba Place over Carbon Canyon Channel — built in 1912 All County BridgesBrowse every bridge record in Orange County.

Top Bridges to Watch in Orange County

Bridge	Reason	Condition	Daily Traffic	Year Built
State Route 55 over Lincoln AVE	Poor condition + traffic exposure	Poor	227,000	1961
SR 55 over S405-n55 Connector	Poor condition + traffic exposure	Poor	167,000	1966
Route 55 over N405-s55 Connector	Poor condition + traffic exposure	Poor	167,000	1966
N5-n57 Connector over W22-n5 Connector	Poor condition + traffic exposure	Poor	62,255	1976
Los Alisos BLVD over Aliso Creek	Poor condition + traffic exposure	Poor	45,250	1973
Los Alisos BLVD over Scrra Bnsf Ry Amtrak	Poor condition + traffic exposure	Poor	42,100	1977
Lakeview Avenue over Santa Ana River Channel	Poor condition + traffic exposure	Poor	37,300	1970
Lambert Road over Brea Canyon Channel	Poor condition + traffic exposure	Poor	36,000	1980
Yorba Linda BLVD over Bnsf Ry Esperanza RD	Poor condition + traffic exposure	Poor	36,000	1981
Taft Avenue over Santa Ana River Channel	Poor condition + traffic exposure	Poor	34,300	1967

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.