US Bridges

W/B Alton Parkway over BNSF RY AMTRAK Metrolink

Fair

Orange County, California · 0.3 MI Ne/O Muirland Blvd · Structure no. 55C0486L

Built
1981
44 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
177 ft
2 main spans
Daily traffic
17,000
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

W/B Alton Parkway over BNSF RY AMTRAK Metrolink is a prestressed concrete continuous box beam or girders - multiple carrying W/B Alton Parkway over BNSF RY AMTRAK Metrolink in Orange County, California. It was built in 1981, so it is 44 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 17,000 vehicles a day, roughly 7% of them trucks, projected to reach 32,800 by 2041. The structure is 177 ft (53.9 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesW/B Alton Parkway
CrossesBNSF RY AMTRAK Metrolink
Location0.3 MI Ne/O Muirland Blvd
RouteCity Street 0
CountyOrange County
StateCalifornia
Coordinates33.64927, -117.72222
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating27.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length177 ft (53.9 m)
Longest span129 ft (39.2 m)
Deck width50 ft (15.2 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,000 (2018)
Projected traffic32,800 by 2041
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was W/B Alton Parkway over BNSF RY AMTRAK Metrolink built?

It was built in 1981, making it 44 years old in 2025.

What condition is W/B Alton Parkway over BNSF RY AMTRAK Metrolink in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2024.

How much traffic does W/B Alton Parkway over BNSF RY AMTRAK Metrolink carry?

About 17,000 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is W/B Alton Parkway over BNSF RY AMTRAK Metrolink?

The structure is 177 ft (53.9 m) long with a longest span of 129 ft (39.2 m) and a deck 50 ft wide.

Who owns W/B Alton Parkway over BNSF RY AMTRAK Metrolink?

It is owned by the City or Municipal Highway Agency.