US Bridges

Tunnel Ave over UP RR

Fair

San Mateo County, California · Tunnel Ave @ UPRR · Structure no. 35C0124

Built
2007
18 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
910 ft
1 main span
Daily traffic
1,000
2007 count
Owner
City
City or Municipal Highway Agency

About this bridge

Tunnel Ave over UP RR is a prestressed concrete stringer/multi-beam or girder carrying Tunnel Ave over UP RR in San Mateo County, California. It was built in 2007, so it is 18 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 1,000 vehicles a day, roughly 7% of them trucks, projected to reach 1,481 by 2041. The structure is 910 ft (277.4 m) long and 46 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesTunnel Ave
CrossesUP RR
LocationTunnel Ave @ UPRR
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.68658, -122.39865
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20
Structure length910 ft (277.4 m)
Longest span130 ft (39.6 m)
Deck width46 ft (14 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2007)
Projected traffic1,481 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed2.5 mi (4 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 Tunnel Ave over UP RR built?

It was built in 2007, making it 18 years old in 2025.

What condition is Tunnel Ave over UP RR 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 2023.

How much traffic does Tunnel Ave over UP RR carry?

About 1,000 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is Tunnel Ave over UP RR?

The structure is 910 ft (277.4 m) long with a longest span of 130 ft (39.6 m) and a deck 46 ft wide.

Who owns Tunnel Ave over UP RR?

It is owned by the City or Municipal Highway Agency.