US Bridges

LA0316 over Icww / Bayou Blue

FairPosted for load

Lafourche Parish, Louisiana · 2.3 MI North of LA 24 · Structure no. 022904120200381

Built
1972
53 years old
Condition
Fair
inspected June 2024
Type
Movable - Swing
Steel
Length
320 ft
1 main span
Daily traffic
2,407
2021 count
Owner
State
State Highway Agency

About this bridge

LA0316 over Icww / Bayou Blue is a steel movable - swing carrying LA0316 over Icww / Bayou Blue in Lafourche 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. Its operating status is: posted for load restriction.

It carries about 2,407 vehicles a day, roughly 13% of them trucks, projected to reach 2,647 by 2041. The structure is 320 ft (97.5 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0316
CrossesIcww / Bayou Blue
Location2.3 MI North of LA 24
RouteState Highway 316
CountyLafourche Parish
StateLouisiana
Coordinates29.57594, -90.6036
Functional classUrban Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating25 US tons
Inventory rating18.7 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckSteel plate
Main spans1 (+10 approach)
Design loadH 15
Structure length320 ft (97.5 m)
Longest span161 ft (49.1 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,407 (2021)
Projected traffic2,647 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was LA0316 over Icww / Bayou Blue built?

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

What condition is LA0316 over Icww / Bayou Blue 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 June 2024.

How much traffic does LA0316 over Icww / Bayou Blue carry?

About 2,407 vehicles per day (2021 count), of which roughly 13% are trucks.

How long is LA0316 over Icww / Bayou Blue?

The structure is 320 ft (97.5 m) long with a longest span of 161 ft (49.1 m) and a deck 24 ft wide.

Who owns LA0316 over Icww / Bayou Blue?

It is owned by the State Highway Agency.