US Bridges

LA0177 over Dolet Bayou

Fair

De Soto Parish, Louisiana · 3.54 MI North of LA 346 · Structure no. 041601060203541

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
140 ft
7 main spans
Daily traffic
2,878
2021 count
Owner
State
State Highway Agency

About this bridge

LA0177 over Dolet Bayou is a concrete slab carrying LA0177 over Dolet Bayou in De Soto Parish, Louisiana. It was built in 1988, so it is 37 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 2,878 vehicles a day, roughly 19% of them trucks, projected to reach 3,165 by 2041. The structure is 140 ft (42.7 m) long and 70 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesLA0177
CrossesDolet Bayou
Location3.54 MI North of LA 346
RouteState Highway 177
CountyDe Soto Parish
StateLouisiana
Coordinates31.95919, -93.4514
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93 US tons
Inventory rating56 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span20 ft (6.1 m)
Deck width70 ft (21.4 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,878 (2021)
Projected traffic3,165 by 2041
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0177 over Dolet Bayou built?

It was built in 1988, making it 37 years old in 2025.

What condition is LA0177 over Dolet 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 June 2023.

How much traffic does LA0177 over Dolet Bayou carry?

About 2,878 vehicles per day (2021 count), of which roughly 19% are trucks.

How long is LA0177 over Dolet Bayou?

The structure is 140 ft (42.7 m) long with a longest span of 20 ft (6.1 m) and a deck 70 ft wide.

Who owns LA0177 over Dolet Bayou?

It is owned by the State Highway Agency.