US Bridges

Old US 190 over Half Moon Bayou

FairPosted for load

St. Landry Parish, Louisiana · 1.1 Mi. W. of LA 3174 · Structure no. 034930324914741

Built
1930
95 years old
Condition
Fair
inspected April 2023
Type
Tee Beam
Concrete
Length
217 ft
8 main spans
Daily traffic
270
2020 count
Owner
County
County Highway Agency

About this bridge

Old US 190 over Half Moon Bayou is a concrete tee beam carrying Old US 190 over Half Moon Bayou in St. Landry Parish, Louisiana. It was built in 1930, so it is 95 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 5 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 270 vehicles a day, projected to reach 297 by 2040. The structure is 217 ft (66.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesOld US 190
CrossesHalf Moon Bayou
Location1.1 Mi. W. of LA 3174
RouteCounty Highway 0
CountySt. Landry Parish
StateLouisiana
Coordinates30.54086, -91.78989
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26.1 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 15
Structure length217 ft (66.1 m)
Longest span27 ft (8.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2020)
Projected traffic297 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Old US 190 over Half Moon Bayou built?

It was built in 1930, making it 95 years old in 2025.

What condition is Old US 190 over Half Moon Bayou 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 April 2023.

How much traffic does Old US 190 over Half Moon Bayou carry?

About 270 vehicles per day (2020 count).

How long is Old US 190 over Half Moon Bayou?

The structure is 217 ft (66.1 m) long with a longest span of 27 ft (8.2 m) and a deck 43 ft wide.

Who owns Old US 190 over Half Moon Bayou?

It is owned by the County Highway Agency.