US Bridges

Island Parkway over Autobahn Motors

Fair

San Mateo County, California · 0.1 M. N. of Marine Pkwy · Structure no. 35C0192

Built
2004
21 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
262 ft
8 main spans
Daily traffic
2,500
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Island Parkway over Autobahn Motors is a concrete continuous slab carrying Island Parkway over Autobahn Motors in San Mateo County, California. It was built in 2004, so it is 21 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 2,500 vehicles a day, roughly 3% of them trucks, projected to reach 3,081 by 2042. The structure is 262 ft (79.9 m) long and 82 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIsland Parkway
CrossesAutobahn Motors
Location0.1 M. N. of Marine Pkwy
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.5277, -122.26937
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length262 ft (79.9 m)
Longest span40 ft (12.2 m)
Deck width82 ft (25.1 m)
Roadway width82 ft (25.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2018)
Projected traffic3,081 by 2042
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 Island Parkway over Autobahn Motors built?

It was built in 2004, making it 21 years old in 2025.

What condition is Island Parkway over Autobahn Motors 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 Island Parkway over Autobahn Motors carry?

About 2,500 vehicles per day (2018 count), of which roughly 3% are trucks.

How long is Island Parkway over Autobahn Motors?

The structure is 262 ft (79.9 m) long with a longest span of 40 ft (12.2 m) and a deck 82 ft wide.

Who owns Island Parkway over Autobahn Motors?

It is owned by the City or Municipal Highway Agency.