US Bridges

I0310 over US 61/RR/SWAMP/LA 626

Fair

St. Charles Parish, Louisiana · 0.41 M South of I-10 · Structure no. 024504503600401

Built
1992
33 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
25,672 ft
467 main spans
Daily traffic
20,850
2016 count
Owner
State
State Highway Agency

About this bridge

I0310 over US 61/RR/SWAMP/LA 626 is a prestressed concrete stringer/multi-beam or girder carrying I0310 over US 61/RR/SWAMP/LA 626 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 20,850 vehicles a day, roughly 25% of them trucks, projected to reach 22,935 by 2036. The structure is 25,672 ft (7,824.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI0310
CrossesUS 61/RR/SWAMP/LA 626
Location0.41 M South of I-10
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates30.00269, -90.2942
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 spans467
Design loadHS 20
Structure length25,672 ft (7,824.8 m)
Longest span90 ft (27.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic20,850 (2016)
Projected traffic22,935 by 2036
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0310 over US 61/RR/SWAMP/LA 626 built?

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

What condition is I0310 over US 61/RR/SWAMP/LA 626 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 September 2024.

How much traffic does I0310 over US 61/RR/SWAMP/LA 626 carry?

About 20,850 vehicles per day (2016 count), of which roughly 25% are trucks.

How long is I0310 over US 61/RR/SWAMP/LA 626?

The structure is 25,672 ft (7,824.8 m) long with a longest span of 90 ft (27.4 m) and a deck 43 ft wide.

Who owns I0310 over US 61/RR/SWAMP/LA 626?

It is owned by the State Highway Agency.