US Bridges

Lathrop ST over Redwood Creek

Fair

San Mateo County, California · South of Maple ST · Structure no. 35C0153

Built
1955
70 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
9,000
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lathrop ST over Redwood Creek is a concrete continuous culvert carrying Lathrop ST over Redwood Creek in San Mateo County, California. It was built in 1955, so it is 70 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 9,000 vehicles a day, roughly 10% of them trucks, projected to reach 10,904 by 2046. The structure is 33 ft (10.1 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesLathrop ST
CrossesRedwood Creek
LocationSouth of Maple ST
RouteCity Street 0
Coordinates37.48138, -122.2261
Functional classUrban Minor 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2018)
Projected traffic10,904 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 Lathrop ST over Redwood Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is Lathrop 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 Lathrop ST over Redwood Creek carry?

About 9,000 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Lathrop ST over Redwood Creek?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m) and a deck 30 ft wide.

Who owns Lathrop ST over Redwood Creek?

It is owned by the City or Municipal Highway Agency.