US Bridges

Airport Term Off-R over US 101

Fair

San Mateo County, California · Ramp from RTE SB 101 · Structure no. 35C0182S

Built
1996
29 years old
Condition
Fair
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,998 ft
14 main spans
Daily traffic
18,400
2010 count
Owner
Local
Other Local Agency

About this bridge

Airport Term Off-R over US 101 is a prestressed concrete continuous box beam or girders - multiple carrying Airport Term Off-R over US 101 in San Mateo County, California. It was built in 1996, so it is 29 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 6 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 18,400 vehicles a day, roughly 5% of them trucks, projected to reach 30,034 by 2042. The structure is 1,998 ft (609 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesAirport Term Off-R
CrossesUS 101
LocationRamp from RTE SB 101
RouteState Highway 101
CountySan Mateo County
StateCalifornia
Coordinates37.61206, -122.39411
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans14 (+9 approach)
Design loadHS 20 + Mod
Structure length1,998 ft (609 m)
Longest span148 ft (45 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic18,400 (2010)
Projected traffic30,034 by 2042
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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 Airport Term Off-R over US 101 built?

It was built in 1996, making it 29 years old in 2025.

What condition is Airport Term Off-R over US 101 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 January 2024.

How much traffic does Airport Term Off-R over US 101 carry?

About 18,400 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is Airport Term Off-R over US 101?

The structure is 1,998 ft (609 m) long with a longest span of 148 ft (45 m) and a deck 28 ft wide.

Who owns Airport Term Off-R over US 101?

It is owned by the Other Local Agency.