US Bridges

Bobtown Bridge RD over Grand Caillou Bayou

PoorPosted for load

Terrebonne Parish, Louisiana · 0.05 MI W of LA 57 · Structure no. 025529283904221

Built
1960
65 years old
Condition
Poor
inspected June 2023
Type
Movable - Swing
Steel
Length
158 ft
1 main span
Daily traffic
2,395
2020 count
Owner
County
County Highway Agency

About this bridge

Bobtown Bridge RD over Grand Caillou Bayou is a steel movable - swing carrying Bobtown Bridge RD over Grand Caillou Bayou in Terrebonne Parish, Louisiana. It was built in 1960, so it is 65 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 2,395 vehicles a day, projected to reach 2,634 by 2040. The structure is 158 ft (48.2 m) long and 16 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesBobtown Bridge RD
CrossesGrand Caillou Bayou
Location0.05 MI W of LA 57
RouteCounty Highway 0
CountyTerrebonne Parish
StateLouisiana
Coordinates29.47258, -90.70224
Functional classRural Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating15.3 US tons
Inventory rating11.8 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length158 ft (48.2 m)
Longest span64 ft (19.5 m)
Deck width16 ft (4.9 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic2,395 (2020)
Projected traffic2,634 by 2040
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$513,000
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Bobtown Bridge RD over Grand Caillou Bayou built?

It was built in 1960, making it 65 years old in 2025.

What condition is Bobtown Bridge RD over Grand Caillou 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 June 2023.

How much traffic does Bobtown Bridge RD over Grand Caillou Bayou carry?

About 2,395 vehicles per day (2020 count).

How long is Bobtown Bridge RD over Grand Caillou Bayou?

The structure is 158 ft (48.2 m) long with a longest span of 64 ft (19.5 m) and a deck 16 ft wide.

Who owns Bobtown Bridge RD over Grand Caillou Bayou?

It is owned by the County Highway Agency.