Orange County, CA

1,224 public highway bridges

Orange County Bridge Snapshot

Orange County, California contains 1,224 public highway bridges in the FHWA National Bridge Inventory. Roughly 35.3% are rated “Good,” 21.2% “Fair,” 2.2% “Poor,” and 2.2% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

1,224

Total Bridges

35.3%

Good

2.2%

Poor

2.2%

Structurally Deficient

Condition Distribution

Good

35.3% (432)

Fair

21.2% (260)

Poor

2.2% (27)

SD

2.2% (27)

All Bridges (1,224)

Sort:

AVENIDA DE LAS BAN

Over: STATE ROUTE 241

12-ORA-241-18.07-RSM, Orange, CA

Built 2003 ADT: 18,300

STA MARGARITA PKWY

Over: STATE ROUTE 241

12-ORA-241-18.53-RSM, Orange, CA

Built 1995 ADT: 18,300

STATE ROUTE 241 SB

Over: MELINDA ROAD

12-ORA-241-19.33-RSM, Orange, CA

Built 1995 ADT: 5,000

STATE ROUTE 241 NB

Over: MELINDA ROAD

12-ORA-241-19.33-RSM, Orange, CA

Built 1995 ADT: 5,000

LOS ALISOS BLVD

Over: STATE ROUTE 241

12-ORA-241-20.12-RSM, Orange, CA

Built 1995 ADT: 42,000

ROUTE 241

Over: ALISO CREEK & EL TORO RD

12-ORA-241-21.00-MSNV, Orange, CA

Built 1995 ADT: 15,000

ROUTE 241

Over: ALISO CREEK & EL TORO RD

12-ORA-241-21.00-MSNV, Orange, CA

Built 1995 ADT: 15,000

STATE ROUTE 241 SB

Over: PORTOLA PARKWAY

12-ORA-241-21.85-LKFR, Orange, CA

Built 1995 ADT: 15,000

STATE ROUTE 241

Over: LAKE FOREST DRIVE

12-ORA-241-22.50-LKFR, Orange, CA

Built 1993 ADT: 15,000

SR 241

Over: BAKE PARKWAY

12-ORA-241-22.77-LKFR, Orange, CA

Built 1993 ADT: 15,000

ALTON PKWY

Over: STATE ROUTE 241

12-ORA-241-23.46-LKFR, Orange, CA

Built 1993 ADT: 43,000

S241-ALTON PKW OFF

Over: TOWNE CENTRE DR

12-ORA-241-23.62-LKFR, Orange, CA

Built 1993 ADT: 5,000

SR 241 SB

Over: TOWNE CENTRE DR

12-ORA-241-23.62-LKFR, Orange, CA

Built 1993 ADT: 5,000

PORTOLA PKWY

Over: STATE ROUTE 241

12-ORA-241-25.02-IRVN, Orange, CA

Built 1996 ADT: 48,000

STATE ROUTE 91 EB

Over: W91-S55 CONNECTOR

12-ORA-091-R9.17-ANA, Orange, CA

Built 1994 ADT: 69,600

91-55 FASTTRACK

Over: W91-S55 CONNECTORS

12-ORA-091-R9.91-ANA, Orange, CA

Built 1994 ADT: 69,600

N5-N73 CONNECTOR

Over: I 5; C. C.; METRO RAIL

12-ORA-005-12.51-LGNG, Orange, CA

Built 1996 ADT: 5,000

S73-S5 CONNECTOR

Over: CAMINO CAPISTRANO,METRO

12-ORA-073-10.34-SJCP, Orange, CA

Built 1996 ADT: 10,000

S73-GLENWOOD OFF

Over: EL TORO RD-S73 ON RAMP

12-ORA-073-15.80, Orange, CA

Built 2003 ADT: 5,000

SR 73 SB

Over: EL TORO ROAD

12-ORA-073-16.25-LGNB, Orange, CA

Built 1996 ADT: 10,000

SR 73 NB

Over: EL TORO ROAD

12-ORA-073-16.25-LGNB, Orange, CA

Built 1996 ADT: 10,000

SR 73 SB

Over: SAN DIEGO CR, UNIVERSITY

12-ORA-073-24.36-NPTB, Orange, CA

Built 1996 ADT: 10,000

SR 73 NB

Over: SAN DIEGO CR, UNIVERSITY

12-ORA-073-24.36-IRVN, Orange, CA

Built 1996 ADT: 10,000

MACARTHUR-S73 ONRA

Over: SR 73 & MACARTHUR-N73 ON

12-ORA-073-24.02-IRVN, Orange, CA

Built 1996 ADT: 66,000

MACARTHUR BLVD

Over: SR 73, RAMPS, BONITA CRK

12-ORA-073-23.82-IRVN, Orange, CA

Built 1996 ADT: 66,000

MACARTHUR-N73 ONRA

Over: SR 73, RAMPS, BONITA CRK

12-ORA-073-23.75-IRVN, Orange, CA

Built 1996 ADT: 4,880

STATE ROUTE 55

Over: UTILITY OC

12-ORA-055-R2.52-CMS, Orange, CA

Built 1992 ADT: 122,000

BAKE PARKWAY

Over: INTERSTATE 5

12-ORA-005-20.84-IRVN, Orange, CA

Built 1996 ADT: 282,000

BAKE PKWY-N405 RMP

Over: INTERSTATE 5

12-ORA-005-21.33-IRVN, Orange, CA

Built 1995 ADT: 28,000

S5-BAKE PKWY OFFRP

Over: I 405,5-405 HOV, & RAMPS

12-ORA-005-21.33-IRVN, Orange, CA

Built 1996 ADT: 2,336

N5-IRVINE CTR OFF

Over: BAKE PKWY-N405 ON-RAMP

12-ORA-005-21.60-IRVN, Orange, CA

Built 1996 ADT: 28,200

BISON AV-N73 ON RA

Over: N73-MACARTHUR BL OFF-RMP

12-ORA-073-23.60-IRVN, Orange, CA

Built 1996 ADT: 5,850

S73-BISON OFF-RAMP

Over: MACARTHUR-S73 ON-RAMP

12-ORA-073-23.60-IRVN, Orange, CA

Built 1996 ADT: 4,880

SR 73 SB

Over: LAGUNA CANYON ROAD

12-ORA-073-16.75-LGNB, Orange, CA

Built 1996 ADT: 10,000

SR 73 NB

Over: LAGUNA CANYON ROAD

12-ORA-073-16.75-LGNB, Orange, CA

Built 1996 ADT: 10,000

SR 73 SB

Over: CABOT ROAD

12-ORA-073-11.28-IRVN, Orange, CA

Built 1996 ADT: 5,000

SR 73 NB

Over: CROWN VALLEY PK,CABOT RD

12-ORA-073-11.31-LGNG, Orange, CA

Built 1996 ADT: 5,000

SR 73 SB

Over: CROWN VALLEY PARKWAY

12-ORA-073-11.42-LGNG, Orange, CA

Built 1996 ADT: 15,000

SR 73 SB

Over: GREENFIELD DRIVE

12-ORA-073-11.76-LGNH, Orange, CA

Built 1996 ADT: 10,000

SR 73 NB

Over: GREENFIELD DRIVE

12-ORA-073-11.76-LGNH, Orange, CA

Built 1996 ADT: 10,000

LA PAZ RD-S73 ON

Over: MOULTON PARKWAY

12-ORA-073-12.91-LGNG, Orange, CA

Built 1996 ADT: 10,000

SR 73 SB

Over: MOULTON PARKWAY

12-ORA-073-12.91-LGNG, Orange, CA

Built 1996 ADT: 10,000

SR 73 NB

Over: MOULTON PARKWAY

12-ORA-073-12.91-LGNG, Orange, CA

Built 1996 ADT: 10,000

N73-LA PAZ RD OFF

Over: MOULTON PARKWAY

12-ORA-073-12.91-LGNG, Orange, CA

Built 1996 ADT: 10,000

LA PAZ RD-S73 ONRA

Over: PACIFIC PARK DRIVE

12-ORA-073-13.16-LGNG, Orange, CA

Built 1996 ADT: 5,000

SR 73 SB

Over: PACIFIC PARK DRIVE

12-ORA-073-13.16-LGNG, Orange, CA

Built 1996 ADT: 5,000

SR 73 NB

Over: PACIFIC PARK DRIVE

12-ORA-073-13.16-LGNG, Orange, CA

Built 1996 ADT: 5,000

MOULTON PKWY-N73

Over: PACIFIC PARK DRIVE

12-ORA-073-13.16-LGNG, Orange, CA

Built 1996 ADT: 5,000

N73-LA PAZ RD OFF

Over: PACIFIC PARK DRIVE

12-ORA-073-13.16-LGNG, Orange, CA

Built 1996 ADT: 5,000

LA PAZ RD-S73 ONRP

Over: LA PAZ ROAD

12-ORA-073-13.40-LGNG, Orange, CA

Built 1996 ADT: 15,000

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026