US Bridges

LA0315 over Provost Bayou

Poor

Terrebonne Parish, Louisiana · 8.6 MI South of LA 661 · Structure no. 025502459001261

Built
1953
72 years old
Condition
Poor
inspected December 2023
Type
Movable - Swing
Steel
Length
176 ft
3 main spans
Daily traffic
6,715
2021 count
Owner
State
State Highway Agency

About this bridge

LA0315 over Provost Bayou is a steel movable - swing carrying LA0315 over Provost Bayou in Terrebonne Parish, Louisiana. It was built in 1953, so it is 72 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.

It carries about 6,715 vehicles a day, roughly 12% of them trucks, projected to reach 7,386 by 2041. The structure is 176 ft (53.6 m) long and 29 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesLA0315
CrossesProvost Bayou
Location8.6 MI South of LA 661
RouteState Highway 315
CountyTerrebonne Parish
StateLouisiana
Coordinates29.4629, -90.7511
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating30.3 US tons
Inventory rating23.3 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length176 ft (53.6 m)
Longest span136 ft (41.5 m)
Deck width29 ft (8.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,715 (2021)
Projected traffic7,386 by 2041
Trucks12%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$802,000
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0315 over Provost Bayou built?

It was built in 1953, making it 72 years old in 2025.

What condition is LA0315 over Provost Bayou 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 December 2023.

How much traffic does LA0315 over Provost Bayou carry?

About 6,715 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0315 over Provost Bayou?

The structure is 176 ft (53.6 m) long with a longest span of 136 ft (41.5 m) and a deck 29 ft wide.

Who owns LA0315 over Provost Bayou?

It is owned by the State Highway Agency.