US Bridges

Interstate 5 SB over Thornton Road

Fair

San Joaquin County, California · 10-SJ-005-38.06 · Structure no. 29 0254L

Built
1976
49 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
86 ft
1 main span
Daily traffic
38,500
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 SB over Thornton Road is a prestressed concrete box beam or girders - multiple carrying Interstate 5 SB over Thornton Road in San Joaquin County, California. It was built in 1976, so it is 49 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 38,500 vehicles a day, roughly 21% of them trucks, projected to reach 63,485 by 2041. The structure is 86 ft (26.3 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 5 SB
CrossesThornton Road
Location10-SJ-005-38.06
RouteInterstate 5
CountySan Joaquin County
StateCalifornia
Coordinates38.09618, -121.38644
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.3 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length86 ft (26.3 m)
Longest span85 ft (25.8 m)
Deck width54 ft (16.6 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,500 (2009)
Projected traffic63,485 by 2041
Trucks21%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Interstate 5 SB over Thornton Road built?

It was built in 1976, making it 49 years old in 2025.

What condition is Interstate 5 SB over Thornton Road 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 March 2023.

How much traffic does Interstate 5 SB over Thornton Road carry?

About 38,500 vehicles per day (2009 count), of which roughly 21% are trucks.

How long is Interstate 5 SB over Thornton Road?

The structure is 86 ft (26.3 m) long with a longest span of 85 ft (25.8 m) and a deck 54 ft wide.

Who owns Interstate 5 SB over Thornton Road?

It is owned by the State Highway Agency.