US Bridges

I0310 over I-10/I-310/SWAMP

Good

St. Charles Parish, Louisiana · 0.4 M South of I-10 · Structure no. 024504503600408

Built
1992
33 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
4,815 ft
66 main spans
Daily traffic
15,642
2021 count
Owner
State
State Highway Agency

About this bridge

I0310 over I-10/I-310/SWAMP is a prestressed concrete continuous stringer/multi-beam or girder carrying I0310 over I-10/I-310/SWAMP 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 15,642 vehicles a day, roughly 25% of them trucks, projected to reach 17,206 by 2041. The structure is 4,815 ft (1,467.6 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesI0310
CrossesI-10/I-310/SWAMP
Location0.4 M South of I-10
RouteInterstate 310
CountySt. Charles Parish
StateLouisiana
Coordinates30.00273, -90.29357
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans66
Design loadHS 20
Structure length4,815 ft (1,467.6 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,642 (2021)
Projected traffic17,206 by 2041
Trucks25%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I0310 over I-10/I-310/SWAMP built?

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

What condition is I0310 over I-10/I-310/SWAMP in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does I0310 over I-10/I-310/SWAMP carry?

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

How long is I0310 over I-10/I-310/SWAMP?

The structure is 4,815 ft (1,467.6 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns I0310 over I-10/I-310/SWAMP?

It is owned by the State Highway Agency.