US Bridges

Interstate 5 SB over Eight Mile RD

Fair

San Joaquin County, California · 10-SJ-005-35.30 · Structure no. 29 0209L

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
134 ft
1 main span
Daily traffic
38,500
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 SB over Eight Mile RD is a prestressed concrete box beam or girders - multiple carrying Interstate 5 SB over Eight Mile RD in San Joaquin County, California. It was built in 1975, so it is 50 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 22% of them trucks, projected to reach 79,630 by 2045. The structure is 134 ft (40.8 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 5 SB
CrossesEight Mile RD
Location10-SJ-005-35.30
RouteInterstate 5
CountySan Joaquin County
StateCalifornia
Coordinates38.05772, -121.37272
Functional classUrban 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 rating47.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length134 ft (40.8 m)
Longest span132 ft (40.3 m)
Deck width55 ft (16.7 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,500 (2009)
Projected traffic79,630 by 2045
Trucks22%
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 Eight Mile RD built?

It was built in 1975, making it 50 years old in 2025.

What condition is Interstate 5 SB over Eight Mile RD 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 Eight Mile RD carry?

About 38,500 vehicles per day (2009 count), of which roughly 22% are trucks.

How long is Interstate 5 SB over Eight Mile RD?

The structure is 134 ft (40.8 m) long with a longest span of 132 ft (40.3 m) and a deck 55 ft wide.

Who owns Interstate 5 SB over Eight Mile RD?

It is owned by the State Highway Agency.