US Bridges

LA0175 over Bayou San Miguel

PoorPosted for load

Sabine Parish, Louisiana · 2.18 M N of N Jct. LA 120 · Structure no. 084300350202181

Built
1950
75 years old
Condition
Poor
inspected August 2024
Type
Tee Beam
Concrete
Length
98 ft
4 main spans
Daily traffic
1,587
2021 count
Owner
State
State Highway Agency

About this bridge

LA0175 over Bayou San Miguel is a concrete tee beam carrying LA0175 over Bayou San Miguel in Sabine Parish, Louisiana. It was built in 1950, so it is 75 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 1,587 vehicles a day, roughly 14% of them trucks, projected to reach 1,745 by 2041. The structure is 98 ft (29.9 m) long and 29 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesLA0175
CrossesBayou San Miguel
Location2.18 M N of N Jct. LA 120
RouteState Highway 175
CountySabine Parish
StateLouisiana
Coordinates31.74607, -93.5094
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.4 US tons
Inventory rating19.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length98 ft (29.9 m)
Longest span24 ft (7.3 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,587 (2021)
Projected traffic1,745 by 2041
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0175 over Bayou San Miguel built?

It was built in 1950, making it 75 years old in 2025.

What condition is LA0175 over Bayou San Miguel in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does LA0175 over Bayou San Miguel carry?

About 1,587 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is LA0175 over Bayou San Miguel?

The structure is 98 ft (29.9 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.

Who owns LA0175 over Bayou San Miguel?

It is owned by the State Highway Agency.