US Bridges

Interstate 5 SB over Downing Avenue

Fair

San Joaquin County, California · 10-SJ-005-R23.66 · Structure no. 29 0222L

Built
1971
54 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
127 ft
1 main span
Daily traffic
43,750
2015 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 SB over Downing Avenue is a prestressed concrete box beam or girders - multiple carrying Interstate 5 SB over Downing Avenue in San Joaquin County, California. It was built in 1971, so it is 54 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 43,750 vehicles a day, roughly 24% of them trucks, projected to reach 85,351 by 2043. The structure is 127 ft (38.7 m) long and 53 ft wide.

Location

Open in Google Maps
CarriesInterstate 5 SB
CrossesDowning Avenue
Location10-SJ-005-R23.66
RouteInterstate 5
CountySan Joaquin County
StateCalifornia
Coordinates37.91288, -121.28958
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.8 US tons
Inventory rating24.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length127 ft (38.7 m)
Longest span126 ft (38.4 m)
Deck width53 ft (16.2 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,750 (2015)
Projected traffic85,351 by 2043
Trucks24%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Downing Avenue built?

It was built in 1971, making it 54 years old in 2025.

What condition is Interstate 5 SB over Downing Avenue 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 October 2023.

How much traffic does Interstate 5 SB over Downing Avenue carry?

About 43,750 vehicles per day (2015 count), of which roughly 24% are trucks.

How long is Interstate 5 SB over Downing Avenue?

The structure is 127 ft (38.7 m) long with a longest span of 126 ft (38.4 m) and a deck 53 ft wide.

Who owns Interstate 5 SB over Downing Avenue?

It is owned by the State Highway Agency.