US Bridges

Stonehedge Road over San Mateo Creek

Fair

San Mateo County, California · 500 Ft N of Bridge RD · Structure no. 35C0202

Built
1900
125 years old
Condition
Fair
inspected May 2023
Type
Arch - Deck
Concrete
Length
30 ft
1 main span
Daily traffic
1,000
2016 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Stonehedge Road over San Mateo Creek is a concrete arch - deck carrying Stonehedge Road over San Mateo Creek in San Mateo County, California. It was built in 1900, so it is 125 years old, older 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 5% of them trucks, projected to reach 1,530 by 2041. The structure is 30 ft (9.1 m) long and 31 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesStonehedge Road
CrossesSan Mateo Creek
Location500 Ft N of Bridge RD
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.56194, -122.33694
Functional classRural 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2016)
Projected traffic1,530 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stonehedge Road over San Mateo Creek built?

It was built in 1900, making it 125 years old in 2025.

What condition is Stonehedge Road over San Mateo Creek 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 May 2023.

How much traffic does Stonehedge Road over San Mateo Creek carry?

About 1,000 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Stonehedge Road over San Mateo Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns Stonehedge Road over San Mateo Creek?

It is owned by the Town or Township Highway Agency.