US Bridges

I0310 over Ramps/Us 61

Fair

St. Charles Parish, Louisiana · 0.2 1M North of US 61 · Structure no. 024504503602567

Built
1992
33 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
3,543 ft
45 main spans
Daily traffic
15,642
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over Ramps/Us 61 is a prestressed concrete stringer/multi-beam or girder carrying I0310 over Ramps/Us 61 in St. Charles Parish, Louisiana. It was built in 1992, so it is 33 years old, younger 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 15,642 vehicles a day, roughly 25% of them trucks, projected to reach 17,206 by 2041. The structure is 3,543 ft (1,079.9 m) long and 28 ft wide.

Location

Open in Google Maps
CarriesI0310
CrossesRamps/Us 61
Location0.2 1M North of US 61
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates29.97925, -90.31459
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
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 alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans45 (+10 approach)
Design loadHS 20
Structure length3,543 ft (1,079.9 m)
Longest span106 ft (32.3 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic15,642 (2021)
Projected traffic17,206 by 2041
Trucks25%
Lanes on structure1
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 I0310 over Ramps/Us 61 built?

It was built in 1992, making it 33 years old in 2025.

What condition is I0310 over Ramps/Us 61 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 I0310 over Ramps/Us 61 carry?

About 15,642 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0310 over Ramps/Us 61?

The structure is 3,543 ft (1,079.9 m) long with a longest span of 106 ft (32.3 m) and a deck 28 ft wide.

Who owns I0310 over Ramps/Us 61?

It is owned by the State Highway Agency.