US Bridges

HWY 3102 over Larto Bayou

FairPosted for load

Catahoula Parish, Louisiana · 3.2 MI W of LA 124 · Structure no. 581331163915841

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
3 main spans
Daily traffic
130
1972 count
Owner
County
County Highway Agency

About this bridge

HWY 3102 over Larto Bayou is a steel stringer/multi-beam or girder carrying HWY 3102 over Larto Bayou in Catahoula Parish, Louisiana. It was built in 1977, so it is 48 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 130 vehicles a day, projected to reach 143 by 1992. The structure is 44 ft (13.4 m) long and 27 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesHWY 3102
CrossesLarto Bayou
Location3.2 MI W of LA 124
RouteCounty Highway 0
CountyCatahoula Parish
StateLouisiana
Coordinates31.33377, -91.93586
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans3
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span15 ft (4.6 m)
Deck width27 ft (8.1 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic130 (1972)
Projected traffic143 by 1992
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 HWY 3102 over Larto Bayou built?

It was built in 1977, making it 48 years old in 2025.

What condition is HWY 3102 over Larto 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 HWY 3102 over Larto Bayou carry?

About 130 vehicles per day (1972 count).

How long is HWY 3102 over Larto Bayou?

The structure is 44 ft (13.4 m) long with a longest span of 15 ft (4.6 m) and a deck 27 ft wide.

Who owns HWY 3102 over Larto Bayou?

It is owned by the County Highway Agency.