US Bridges

I0310 over Ramp"c"from I 310 SB

Fair

St. Charles Parish, Louisiana · .36 MI South of LA 18 · Structure no. 024504503800362

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,290 ft
16 main spans
Daily traffic
29,468
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over Ramp"c"from I 310 SB is a prestressed concrete continuous stringer/multi-beam or girder carrying I0310 over Ramp"c"from I 310 SB in St. Charles Parish, Louisiana. It was built in 1979, so it is 46 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 29,468 vehicles a day, roughly 25% of them trucks, projected to reach 32,414 by 2041. The structure is 1,290 ft (393.2 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI0310
CrossesRamp"c"from I 310 SB
Location.36 MI South of LA 18
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates29.93018, -90.38189
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadHS 20
Structure length1,290 ft (393.2 m)
Longest span93 ft (28.3 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,468 (2021)
Projected traffic32,414 by 2041
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 I0310 over Ramp"c"from I 310 SB built?

It was built in 1979, making it 46 years old in 2025.

What condition is I0310 over Ramp"c"from I 310 SB 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 2024.

How much traffic does I0310 over Ramp"c"from I 310 SB carry?

About 29,468 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0310 over Ramp"c"from I 310 SB?

The structure is 1,290 ft (393.2 m) long with a longest span of 93 ft (28.3 m) and a deck 41 ft wide.

Who owns I0310 over Ramp"c"from I 310 SB?

It is owned by the State Highway Agency.