US Bridges

Interstate 5 over Mission Road

Fair

Los Angeles County, California · 07-LA-005-18.78-LA · Structure no. 53 1312

Built
1959
66 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
117 ft
1 main span
Daily traffic
243,652
2020 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 over Mission Road is a concrete box beam or girders - multiple carrying Interstate 5 over Mission Road in Los Angeles County, California. It was built in 1959, so it is 66 years old, older 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 243,652 vehicles a day, roughly 6% of them trucks, projected to reach 257,000 by 2041. The structure is 117 ft (35.7 m) long and 150 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 5
CrossesMission Road
Location07-LA-005-18.78-LA
RouteInterstate 5
CountyLos Angeles County
StateCalifornia
Coordinates34.06018, -118.21473
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79.3 US tons
Inventory rating57.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length117 ft (35.7 m)
Longest span115 ft (35.1 m)
Deck width150 ft (45.6 m)
Roadway width142 ft (43.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic243,652 (2020)
Projected traffic257,000 by 2041
Trucks6%
Lanes on structure12
Traffic directionTwo-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 over Mission Road built?

It was built in 1959, making it 66 years old in 2025.

What condition is Interstate 5 over Mission 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 over Mission Road carry?

About 243,652 vehicles per day (2020 count), of which roughly 6% are trucks.

How long is Interstate 5 over Mission Road?

The structure is 117 ft (35.7 m) long with a longest span of 115 ft (35.1 m) and a deck 150 ft wide.

Who owns Interstate 5 over Mission Road?

It is owned by the State Highway Agency.