US Bridges

I0010 over Bonnet Carre Spillway

Fair

St. Charles Parish, Louisiana · 1.9 MI East of I-55 · Structure no. 024504501400001

Built
1972
53 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
50,772 ft
769 main spans
Daily traffic
48,723
2021 count
Owner
State
State Highway Agency

About this bridge

I0010 over Bonnet Carre Spillway is a steel stringer/multi-beam or girder carrying I0010 over Bonnet Carre Spillway in St. Charles Parish, Louisiana. It was built in 1972, so it is 53 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 48,723 vehicles a day, roughly 25% of them trucks, projected to reach 53,595 by 2041. The structure is 50,772 ft (15,475.3 m) long and 46 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

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CarriesI0010
CrossesBonnet Carre Spillway
Location1.9 MI East of I-55
RouteInterstate 10
CountySt. Charles Parish
StateLouisiana
Coordinates30.07939, -90.4102
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating71 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans769 (+10 approach)
Design loadHS 20
Structure length50,772 ft (15,475.3 m)
Longest span150 ft (45.7 m)
Deck width46 ft (13.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deck18 ft (5.5 m)

Traffic and service

Average daily traffic48,723 (2021)
Projected traffic53,595 by 2041
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 I0010 over Bonnet Carre Spillway built?

It was built in 1972, making it 53 years old in 2025.

What condition is I0010 over Bonnet Carre Spillway 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 November 2024.

How much traffic does I0010 over Bonnet Carre Spillway carry?

About 48,723 vehicles per day (2021 count), of which roughly 25% are trucks.

How long is I0010 over Bonnet Carre Spillway?

The structure is 50,772 ft (15,475.3 m) long with a longest span of 150 ft (45.7 m) and a deck 46 ft wide.

Who owns I0010 over Bonnet Carre Spillway?

It is owned by the State Highway Agency.