US Bridges

Gamm RD over Swift Bayou

Good

Caddo Parish, Louisiana · 0.49 Mi. N. of Self Road · Structure no. 040900000040333

Built
2013
12 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
36 ft
4 main spans
Daily traffic
162
2021 count
Owner
County
County Highway Agency

About this bridge

Gamm RD over Swift Bayou is a concrete culvert carrying Gamm RD over Swift Bayou in Caddo Parish, Louisiana. It was built in 2013, so it is 12 years old, younger than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 162 vehicles a day, projected to reach 178 by 2041. The structure is 36 ft (11 m) long and 68 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesGamm RD
CrossesSwift Bayou
Location0.49 Mi. N. of Self Road
RouteCounty Highway 0
CountyCaddo Parish
StateLouisiana
Coordinates32.75247, -93.88194
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length36 ft (11 m)
Longest span5 ft (1.5 m)
Deck width68 ft (20.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic162 (2021)
Projected traffic178 by 2041
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Gamm RD over Swift Bayou built?

It was built in 2013, making it 12 years old in 2025.

What condition is Gamm RD over Swift Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does Gamm RD over Swift Bayou carry?

About 162 vehicles per day (2021 count).

How long is Gamm RD over Swift Bayou?

The structure is 36 ft (11 m) long with a longest span of 5 ft (1.5 m) and a deck 68 ft wide.

Who owns Gamm RD over Swift Bayou?

It is owned by the County Highway Agency.