US Bridges

Interstate 5 SB over Oak Flat Road

Poor

Stanislaus County, California · 10-STA-005-12.53 · Structure no. 38 0116L

Built
1967
58 years old
Condition
Poor
inspected February 2024
Type
Tee Beam
Concrete Continuous
Length
104 ft
3 main spans
Daily traffic
18,000
2009 count
Owner
State
State Highway Agency

About this bridge

Interstate 5 SB over Oak Flat Road is a concrete continuous tee beam carrying Interstate 5 SB over Oak Flat Road in Stanislaus County, California. It was built in 1967, so it is 58 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 18,000 vehicles a day, roughly 25% of them trucks, projected to reach 23,312 by 2046. The structure is 104 ft (31.7 m) long and 42 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesInterstate 5 SB
CrossesOak Flat Road
Location10-STA-005-12.53
RouteInterstate 5
Coordinates37.42082, -121.15309
Functional classRural 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating25.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length104 ft (31.7 m)
Longest span42 ft (12.8 m)
Deck width42 ft (12.9 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2009)
Projected traffic23,312 by 2046
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$685,000 (2017 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Interstate 5 SB over Oak Flat Road built?

It was built in 1967, making it 58 years old in 2025.

What condition is Interstate 5 SB over Oak Flat Road 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 February 2024.

How much traffic does Interstate 5 SB over Oak Flat Road carry?

About 18,000 vehicles per day (2009 count), of which roughly 25% are trucks.

How long is Interstate 5 SB over Oak Flat Road?

The structure is 104 ft (31.7 m) long with a longest span of 42 ft (12.8 m) and a deck 42 ft wide.

Who owns Interstate 5 SB over Oak Flat Road?

It is owned by the State Highway Agency.