US Bridges

Southfront Road over Arroyo Seco

Fair

Alameda County, California · 0.1 KM W of State RTE 84 · Structure no. 33C0415

Built
1999
26 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
59 ft
4 main spans
Daily traffic
2,650
2009 count
Owner
City
City or Municipal Highway Agency

About this bridge

Southfront Road over Arroyo Seco is a concrete continuous culvert carrying Southfront Road over Arroyo Seco in Alameda County, California. It was built in 1999, so it is 26 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 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 2,650 vehicles a day, roughly 5% of them trucks, projected to reach 6,542 by 2041. The structure is 59 ft (18 m) long and 96 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSouthfront Road
CrossesArroyo Seco
Location0.1 KM W of State RTE 84
RouteCity Street 0
CountyAlameda County
StateCalifornia
Coordinates37.69947, -121.74112
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadUnknown
Structure length59 ft (18 m)
Longest span14 ft (4.3 m)
Deck width96 ft (29.3 m)
Roadway width61 ft (18.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,650 (2009)
Projected traffic6,542 by 2041
Trucks5%
Lanes on structure5
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Southfront Road over Arroyo Seco built?

It was built in 1999, making it 26 years old in 2025.

What condition is Southfront Road over Arroyo Seco 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 November 2023.

How much traffic does Southfront Road over Arroyo Seco carry?

About 2,650 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Southfront Road over Arroyo Seco?

The structure is 59 ft (18 m) long with a longest span of 14 ft (4.3 m) and a deck 96 ft wide.

Who owns Southfront Road over Arroyo Seco?

It is owned by the City or Municipal Highway Agency.