US Bridges

ROAD-1 North over Mcdonnell RD

Fair

San Mateo County, California · East of SH 101 · Structure no. 35C0140L

Built
1970
55 years old
Condition
Fair
inspected January 2024
Type
Slab
Prestressed Concrete Continuous
Length
126 ft
4 main spans
Daily traffic
31,980
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

ROAD-1 North over Mcdonnell RD is a prestressed concrete continuous slab carrying ROAD-1 North over Mcdonnell RD in San Mateo County, California. It was built in 1970, so it is 55 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 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 31,980 vehicles a day, roughly 5% of them trucks, projected to reach 61,180 by 2042. The structure is 126 ft (38.4 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesROAD-1 North
CrossesMcdonnell RD
LocationEast of SH 101
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.61466, -122.39341
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span48 ft (14.6 m)
Deck width80 ft (24.4 m)
Roadway width73 ft (22.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,980 (2010)
Projected traffic61,180 by 2042
Trucks5%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
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 ROAD-1 North over Mcdonnell RD built?

It was built in 1970, making it 55 years old in 2025.

What condition is ROAD-1 North over Mcdonnell RD 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 ROAD-1 North over Mcdonnell RD carry?

About 31,980 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is ROAD-1 North over Mcdonnell RD?

The structure is 126 ft (38.4 m) long with a longest span of 48 ft (14.6 m) and a deck 80 ft wide.

Who owns ROAD-1 North over Mcdonnell RD?

It is owned by the City or Municipal Highway Agency.