US Bridges

Gamm RD over Gamm RD Swift Bayou

Fair

Caddo Parish, Louisiana · 1.74 MI N of Self Road · Structure no. 040932462935301

Built
1980
45 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
77 ft
4 main spans
Daily traffic
77
2019 count
Owner
County
County Highway Agency

About this bridge

Gamm RD over Gamm RD Swift Bayou is a concrete slab carrying Gamm RD over Gamm RD Swift Bayou in Caddo Parish, Louisiana. It was built in 1980, so it is 45 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 77 vehicles a day, projected to reach 84 by 2039. The structure is 77 ft (23.5 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesGamm RD
CrossesGamm RD Swift Bayou
Location1.74 MI N of Self Road
RouteCounty Highway 0
CountyCaddo Parish
StateLouisiana
Coordinates32.77101, -93.88394
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span19 ft (5.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77 (2019)
Projected traffic84 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Gamm RD over Gamm RD Swift Bayou built?

It was built in 1980, making it 45 years old in 2025.

What condition is Gamm RD over Gamm RD Swift 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 March 2023.

How much traffic does Gamm RD over Gamm RD Swift Bayou carry?

About 77 vehicles per day (2019 count).

How long is Gamm RD over Gamm RD Swift Bayou?

The structure is 77 ft (23.5 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.

Who owns Gamm RD over Gamm RD Swift Bayou?

It is owned by the County Highway Agency.