US Bridges

Feather River DR over Fourteen Mile Slough

Fair

San Joaquin County, California · 1.0 MI N of March Lane · Structure no. 29C0401

Built
1992
33 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
364 ft
11 main spans
Daily traffic
8,300
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Feather River DR over Fourteen Mile Slough is a concrete continuous slab carrying Feather River DR over Fourteen Mile Slough in San Joaquin County, California. It was built in 1992, so it is 33 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 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 8,300 vehicles a day, roughly 3% of them trucks, projected to reach 10,724 by 2045. The structure is 364 ft (110.9 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFeather River DR
CrossesFourteen Mile Slough
Location1.0 MI N of March Lane
RouteCity Street 0
Coordinates37.99612, -121.34967
Functional classUrban 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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length364 ft (110.9 m)
Longest span33 ft (10.1 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,300 (2017)
Projected traffic10,724 by 2045
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Feather River DR over Fourteen Mile Slough built?

It was built in 1992, making it 33 years old in 2025.

What condition is Feather River DR over Fourteen Mile Slough 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 2025.

How much traffic does Feather River DR over Fourteen Mile Slough carry?

About 8,300 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is Feather River DR over Fourteen Mile Slough?

The structure is 364 ft (110.9 m) long with a longest span of 33 ft (10.1 m) and a deck 52 ft wide.

Who owns Feather River DR over Fourteen Mile Slough?

It is owned by the City or Municipal Highway Agency.