US Bridges

LA0174 over I-49

Fair

Natchitoches Parish, Louisiana · I-49 /La 174 Interchange · Structure no. 083501120604801

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
462 ft
3 main spans
Daily traffic
760
2021 count
Owner
State
State Highway Agency

About this bridge

LA0174 over I-49 is a prestressed concrete continuous stringer/multi-beam or girder carrying LA0174 over I-49 in Natchitoches Parish, Louisiana. It was built in 1985, so it is 40 years old, younger 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 760 vehicles a day, roughly 14% of them trucks, projected to reach 836 by 2041. The structure is 462 ft (140.8 m) long and 69 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesLA0174
CrossesI-49
LocationI-49 /La 174 Interchange
RouteState Highway 174
Coordinates31.88513, -93.3696
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length462 ft (140.8 m)
Longest span101 ft (30.8 m)
Deck width69 ft (20.9 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic760 (2021)
Projected traffic836 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed14.3 mi (23 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was LA0174 over I-49 built?

It was built in 1985, making it 40 years old in 2025.

What condition is LA0174 over I-49 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 February 2024.

How much traffic does LA0174 over I-49 carry?

About 760 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0174 over I-49?

The structure is 462 ft (140.8 m) long with a longest span of 101 ft (30.8 m) and a deck 69 ft wide.

Who owns LA0174 over I-49?

It is owned by the State Highway Agency.