US Bridges

LA1077 over I-12

Fair

St. Tammany Parish, Louisiana · LA1077 · Structure no. 625208520302851

Built
1975
50 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
384 ft
4 main spans
Daily traffic
7,611
2021 count
Owner
State
State Highway Agency

About this bridge

LA1077 over I-12 is a steel stringer/multi-beam or girder carrying LA1077 over I-12 in St. Tammany Parish, Louisiana. It was built in 1975, so it is 50 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 7,611 vehicles a day, roughly 8% of them trucks, projected to reach 8,372 by 2041. The structure is 384 ft (117 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesLA1077
CrossesI-12
LocationLA1077
RouteState Highway 1077
CountySt. Tammany Parish
StateLouisiana
Coordinates30.45717, -90.1774
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length384 ft (117 m)
Longest span118 ft (36 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,611 (2021)
Projected traffic8,372 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA1077 over I-12 built?

It was built in 1975, making it 50 years old in 2025.

What condition is LA1077 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 LA1077 over I-12 carry?

About 7,611 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is LA1077 over I-12?

The structure is 384 ft (117 m) long with a longest span of 118 ft (36 m) and a deck 43 ft wide.

Who owns LA1077 over I-12?

It is owned by the State Highway Agency.