US Bridges

LA1088 over I-12

Fair

St. Tammany Parish, Louisiana · 2.5 M E of LA 59 · Structure no. 625208521103301

Built
1976
49 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
348 ft
4 main spans
Daily traffic
9,722
2021 count
Owner
State
State Highway Agency

About this bridge

LA1088 over I-12 is a steel continuous stringer/multi-beam or girder carrying LA1088 over I-12 in St. Tammany Parish, Louisiana. It was built in 1976, so it is 49 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 9,722 vehicles a day, roughly 8% of them trucks, projected to reach 10,694 by 2041. The structure is 348 ft (106.1 m) long and 30 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesLA1088
CrossesI-12
Location2.5 M E of LA 59
RouteState Highway 1088
CountySt. Tammany Parish
StateLouisiana
Coordinates30.39238, -90.00351
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length348 ft (106.1 m)
Longest span113 ft (34.4 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,722 (2021)
Projected traffic10,694 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.9 mi (24 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$1.5 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA1088 over I-12 built?

It was built in 1976, making it 49 years old in 2025.

What condition is LA1088 over I-12 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 August 2023.

How much traffic does LA1088 over I-12 carry?

About 9,722 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA1088 over I-12?

The structure is 348 ft (106.1 m) long with a longest span of 113 ft (34.4 m) and a deck 30 ft wide.

Who owns LA1088 over I-12?

It is owned by the State Highway Agency.