US Bridges

Maple ST over Redwood Creek

Fair

San Mateo County, California · North Lathrop ST · Structure no. 35C0128

Built
1919
106 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
45 ft
1 main span
Daily traffic
2,350
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

Maple ST over Redwood Creek is a concrete tee beam carrying Maple ST over Redwood Creek in San Mateo County, California. It was built in 1919, so it is 106 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 2,350 vehicles a day, roughly 10% of them trucks, projected to reach 1,109 by 2046. The structure is 45 ft (13.7 m) long and 49 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMaple ST
CrossesRedwood Creek
LocationNorth Lathrop ST
RouteCity Street 0
CountySan Mateo County
StateCalifornia
Coordinates37.48212, -122.22634
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating27.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length45 ft (13.7 m)
Longest span42 ft (12.8 m)
Deck width49 ft (15 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,350 (2010)
Projected traffic1,109 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Maple ST over Redwood Creek built?

It was built in 1919, making it 106 years old in 2025.

What condition is Maple ST over Redwood 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 2024.

How much traffic does Maple ST over Redwood Creek carry?

About 2,350 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Maple ST over Redwood Creek?

The structure is 45 ft (13.7 m) long with a longest span of 42 ft (12.8 m) and a deck 49 ft wide.

Who owns Maple ST over Redwood Creek?

It is owned by the City or Municipal Highway Agency.