US Bridges

Interstate 5 over Monte Diablo Ave

Poor

San Joaquin County, California · 10-SJ-005-27.91-STKN · Structure no. 29 0188L

Built
1970
55 years old
Condition
Poor
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
166 ft
1 main span
Daily traffic
113,000
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 over Monte Diablo Ave is a prestressed concrete box beam or girders - multiple carrying Interstate 5 over Monte Diablo Ave in San Joaquin County, California. It was built in 1970, so it is 55 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 113,000 vehicles a day, roughly 7% of them trucks, projected to reach 227,345 by 2041. The structure is 166 ft (50.6 m) long and 68 ft wide.

Location

Open in Google Maps
CarriesInterstate 5
CrossesMonte Diablo Ave
Location10-SJ-005-27.91-STKN
RouteInterstate 5
CountySan Joaquin County
StateCalifornia
Coordinates37.95705, -121.3292
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length166 ft (50.6 m)
Longest span166 ft (50.6 m)
Deck width68 ft (20.7 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic113,000 (2009)
Projected traffic227,345 by 2041
Trucks7%
Lanes on structure4
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.8 million (2018 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interstate 5 over Monte Diablo Ave built?

It was built in 1970, making it 55 years old in 2025.

What condition is Interstate 5 over Monte Diablo Ave in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does Interstate 5 over Monte Diablo Ave carry?

About 113,000 vehicles per day (2009 count), of which roughly 7% are trucks.

How long is Interstate 5 over Monte Diablo Ave?

The structure is 166 ft (50.6 m) long with a longest span of 166 ft (50.6 m) and a deck 68 ft wide.

Who owns Interstate 5 over Monte Diablo Ave?

It is owned by the State Highway Agency.